* helm: Fix consistent list indentation

* helm: Add helm lint and helm template tests

* helm: Add helm template --validate test

* helm: Add helm install test

* Revert "Fix helm chart use of Postgres Password (#19537)"

This reverts commit 6094a916.

* Revert "Fix PostgreSQL password reference for jobs (#19504)"

This reverts commit dae954ef.

* Revert "Fix PostgreSQL password reference (#19502)"

This reverts commit 9bf6a8af.

* Correct default username in postgresql auth

Fixes #19536

* Mark job pods not to use Istio's envoy sidecar

Istio injects sidecars into pods to implement mTLS between pods. Jobs
usually don't know about this, so they don't signal the Envoy process
to stop when the job finishes. Since at least one process is running
in the pod, Kubernetes doesn't consider the job to be completed, so it
lingers.

By adding the `sidecar.istio.io/inject` annotation set to `"false"`,
we let Istio know that it should not inject the sidecar. If Istio is
not installed, then this has no impact.

* Support arbitrary job annotations in the Helm chart

Rather than focus on Istio, this allows arbitrary annotations for job pods.

* Add in-line documentation for pod/job annotations

* Add ability to specify an existing Secret (#18139)

Closes #18139

* Allow using secrets with external postgres

* Upgrade CronJob to batch/v1

* Allow using redis.auth.existingSecret

* Helmignore mastodon-*.tgz for easy local development

* Upgrade helm dependencies

* Upgrade postgresql to 11

* Allow putting SMTP password into a secret

* Add optional login to SMTP secret

This to allow setting LOGIN either in values.yaml or
in the secret.

* Switch to bitnami charts full archive

This prevents older versions from disappearing, see
https://github.com/bitnami/charts/issues/10539

 for
full context.

Co-authored-by: Ted Tramonte <ted.tramonte@gmail.com>

- move application variables under `mastodon` namespace
- restore standard yaml structure for ingress configuration
- move values.yaml.template to values.yaml

* add Helm chart

known issues/future work:

- SSO is unsupported

- S3/Minio/GCS is unsupported

- Swift is unsupported

- WEB_DOMAIN is unsupported

- Tor is unsupported

* helm: clarify how LOCAL_DOMAIN is set

* helm: add chart description

* helm: make DB_POOL and Sidekiq concurrency configurable

* helm: only enforce pod affinity when using ReadWriteOnce

* helm: clarify compatibility

* helm: clean up application variables

* helm: add job to create initial admin