* Format, apply hadolint suggestions, little nitpicks

* Use pre compiled jemalloc

* Use tini from package repository

As far as I understand, the brakeman warning was a false-positive as
`content_tag` properly escapes untrusted HTML. Furthermore, the interpolated
string values are built from the “username” part of accounts, which is
restricted to a small subset of ASCII that precludes any XML entity or HTML
code.

This proposed change should be functionally equivalent to the current code,
however it is slightly more robust, it's more idiomatic, and Brakeman will
stop complaining about it.

* Bypass MX validation for explicitly allowed domains

This spares some lookups and prevent issues in some edge cases with
local domains.

* Add tests

* Fix test

* Removing last-child padding conflicts with light theme in hero widget

* Add missing background color to widget

* Reset widget.scss to default

* Hope this works

Co-authored-by: koyu <me@koyu.space>

* Add missing `en.notification_mailer.status.subject`

* Update en.yml

* Improve account counters handling

* Use ActiveRecord::Base::sanitize_sql to pass values instead of interpolating them

Keep using string interpolation for `key` as it is safe and using
“ActiveRecord::Base::sanitize_sql_hash_for_assignment” would require stitching
bits of SQL in a way that is not more easily checked for safety.

* Add migration hook to catch PostgreSQL versions earlier than 9.5

Mastodon::MigrationHelpers has been forked from Gitlab a long time ago, but
Mastodon has never supported using a MySQL database.

Removing MySQL support from Mastodon::MigrationHelpers makes it a little easier
to maintain. In particular, it removes code that would need updating with
Rails 6.

Hopefully fixes #15922

Also update support up to latest database schema version

* Use ActiveRecord::Result#to_ary instead of deprecated to_hash

They do the same thing, and to_hash has been removed from Rails 6.1

* Explicitly name polymorphic indexes to workaround a bug in Rails 6.1

cf. https://github.com/rails/rails/issues/41693

* Fix incorrect usage of “foreign_key” in migration script

* Use `ActiveModel::Errors#delete` instead of deprecated clear method

* Fix link headers tests on Rails 6.1

Rails 6.1 adds values to the Link header by default, thus it is not a
LinkHeader object anymore. Fix the test to parse the Link header instead
of assuming it is a LinkHeader.

Fixes #15133

* Prepare Mastodon for zeitwerk autoloader (Rails 6)

Add inflections and rename/move a few classes.

In particular, app/lib/exceptions.rb and app/lib/sanitize_config.rb
were manually loaded while still in autoload paths.

* Add inflection for Url → URL

* Fix cache_collection crashing when given an empty collection

* Add tests

* Fix misuse of foreign_type

* Fix use of removed "add_template_helper"

* Use response.media_type instead of response.content_type in tests

* Fix CSV export controller test on Rails 6

Rails 6 sets a "filename*" field in the Content-Disposition header to
explicitly encode the filename as UTF-8.

This changes checks the first part of the Content-Disposition header so
it matches in both Rails 5 and Rails 6.

* Fix emoji formatting with Rails 6

* Make emoji output more idiomatic and robust

* Switch from redis-rails gem to built-in Rails redis cache storage

Bumps [rspec-rails](https://github.com/rspec/rspec-rails) from 4.1.0 to 5.0.0.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/main/Changelog.md)
- [Commits](https://github.com/rspec/rspec-rails/compare/v4.1.0...v5.0.0

)

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Bumps [@babel/plugin-transform-runtime](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-transform-runtime) from 7.13.9 to 7.13.10.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.13.10/packages/babel-plugin-transform-runtime

)

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Bumps [bundler-audit](https://github.com/postmodern/bundler-audit) from 0.7.0.1 to 0.8.0.
- [Release notes](https://github.com/postmodern/bundler-audit/releases)
- [Changelog](https://github.com/rubysec/bundler-audit/blob/master/ChangeLog.md)
- [Commits](https://github.com/postmodern/bundler-audit/compare/v0.7.0.1...v0.8.0

)

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Bumps [@babel/runtime](https://github.com/babel/babel/tree/HEAD/packages/babel-runtime) from 7.13.9 to 7.13.10.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.13.10/packages/babel-runtime

)

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Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.13.9 to 7.13.10.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.13.10/packages/babel-preset-env

)

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Bumps [eslint](https://github.com/eslint/eslint) from 7.21.0 to 7.22.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.21.0...v7.22.0

)

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Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v5.1.1...v5.1.2

)

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Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.13.8 to 7.13.10.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.13.10/packages/babel-core

)

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Bumps [react-toggle](https://github.com/aaronshaf/react-toggle) from 4.1.1 to 4.1.2.
- [Release notes](https://github.com/aaronshaf/react-toggle/releases)
- [Changelog](https://github.com/aaronshaf/react-toggle/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aaronshaf/react-toggle/commits

)

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Remove locks from scheduled jobs

Bumps [pghero](https://github.com/ankane/pghero) from 2.7.4 to 2.8.0.
- [Release notes](https://github.com/ankane/pghero/releases)
- [Changelog](https://github.com/ankane/pghero/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/pghero/compare/v2.7.4...v2.8.0

)

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The exports page showed a different "CSV" capitalisation in the
"Bookmarks" row ("Csv") compared to the other rows ("CSV").
This was due to a referece to a translation string that does not exist,
`bookmarks.csv`, defaulting to the key's last segment in title case.

This issue was introduced in commit dcd86204 (PR #14956).

(h/t @meqif for helping with figuring out the bug)

Bumps [json-ld-preloaded](https://github.com/ruby-rdf/json-ld-preloaded) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/ruby-rdf/json-ld-preloaded/releases)
- [Commits](https://github.com/ruby-rdf/json-ld-preloaded/compare/3.1.4...3.1.5

)

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Bumps [oj](https://github.com/ohler55/oj) from 3.11.2 to 3.11.3.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/ohler55/oj/compare/v3.11.2...v3.11.3

)

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Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.11.1 to 1.11.2.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.11.1...v1.11.2

)

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Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.5.1 to 3.5.2.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](https://github.com/grosser/parallel_tests/compare/v3.5.1...v3.5.2

)

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Bumps [ox](https://github.com/ohler55/ox) from 2.14.2 to 2.14.3.
- [Release notes](https://github.com/ohler55/ox/releases)
- [Changelog](https://github.com/ohler55/ox/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/ohler55/ox/compare/v2.14.2...v2.14.3

)

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Bumps [aws-sdk-s3](https://github.com/aws/aws-sdk-ruby) from 1.89.0 to 1.91.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/version-3/gems/aws-sdk-s3/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits

)

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Bumps [sidekiq-unique-jobs](https://github.com/mhenrixon/sidekiq-unique-jobs) from 6.0.25 to 7.0.4.
- [Release notes](https://github.com/mhenrixon/sidekiq-unique-jobs/releases)
- [Changelog](https://github.com/mhenrixon/sidekiq-unique-jobs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mhenrixon/sidekiq-unique-jobs/compare/v6.0.25...v7.0.4

)

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Bumps [faker](https://github.com/faker-ruby/faker) from 2.16.0 to 2.17.0.
- [Release notes](https://github.com/faker-ruby/faker/releases)
- [Changelog](https://github.com/faker-ruby/faker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/faker-ruby/faker/compare/v2.16.0...v2.17.0

)

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* Bump sidekiq-unique-jobs from 6.0.25 to 7.0.1

Bumps [sidekiq-unique-jobs](https://github.com/mhenrixon/sidekiq-unique-jobs) from 6.0.25 to 7.0.1.
- [Release notes](https://github.com/mhenrixon/sidekiq-unique-jobs/releases)
- [Changelog](https://github.com/mhenrixon/sidekiq-unique-jobs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mhenrixon/sidekiq-unique-jobs/compare/v6.0.25...v7.0.1

)

Signed-off-by: dependabot[bot] <support@github.com>

* Fix migration being broken by sidekiq-unique-jobs update

* Fix migration script following API changes in dependency

* Fixup

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: ThibG <thib@sitedethib.com>