Docker: Use precompiled jemalloc, format, apply hadolint suggestions (#10823)

* Format, apply hadolint suggestions, little nitpicks

* Use pre compiled jemalloc

* Use tini from package repository

Dockerfile

 FROM ubuntu:20.04 as build-dep
 
 # Use bash for the shell
-SHELL ["/usr/bin/bash", "-c"]
+SHELL ["/bin/bash", "-c"]
 
 # Install Node v12 (LTS)
 ENV NODE_VER="12.21.0"
@@ -17,35 +17,19 @@ RUN ARCH= && \
     *) echo "unsupported architecture"; exit 1 ;; \
   esac && \
     echo "Etc/UTC" > /etc/localtime && \
-	apt update && \
-	apt -y install wget python && \
+	apt-get update && \
+	apt-get install -y --no-install-recommends ca-certificates wget python && \
 	cd ~ && \
-	wget https://nodejs.org/download/release/v$NODE_VER/node-v$NODE_VER-linux-$ARCH.tar.gz && \
+	wget -q https://nodejs.org/download/release/v$NODE_VER/node-v$NODE_VER-linux-$ARCH.tar.gz && \
 	tar xf node-v$NODE_VER-linux-$ARCH.tar.gz && \
 	rm node-v$NODE_VER-linux-$ARCH.tar.gz && \
 	mv node-v$NODE_VER-linux-$ARCH /opt/node
 
-# Install jemalloc
-ENV JE_VER="5.2.1"
-RUN apt update && \
-	apt -y install make autoconf gcc g++ && \
-	cd ~ && \
-	wget https://github.com/jemalloc/jemalloc/archive/$JE_VER.tar.gz && \
-	tar xf $JE_VER.tar.gz && \
-	cd jemalloc-$JE_VER && \
-	./autogen.sh && \
-	./configure --prefix=/opt/jemalloc && \
-	make -j$(nproc) > /dev/null && \
-	make install_bin install_include install_lib && \
-	cd .. && rm -rf jemalloc-$JE_VER $JE_VER.tar.gz
-
 # Install Ruby
 ENV RUBY_VER="2.7.2"
-ENV CPPFLAGS="-I/opt/jemalloc/include"
-ENV LDFLAGS="-L/opt/jemalloc/lib/"
-RUN apt update && \
-	apt -y install build-essential \
-		bison libyaml-dev libgdbm-dev libreadline-dev \
+RUN apt-get update && \
+  apt-get install -y --no-install-recommends build-essential \
+    bison libyaml-dev libgdbm-dev libreadline-dev libjemalloc-dev \
 		libncurses5-dev libffi-dev zlib1g-dev libssl-dev && \
 	cd ~ && \
 	wget https://cache.ruby-lang.org/pub/ruby/${RUBY_VER%.*}/ruby-$RUBY_VER.tar.gz && \
@@ -55,17 +39,16 @@ RUN apt update && \
 	  --with-jemalloc \
 	  --with-shared \
 	  --disable-install-doc && \
-	ln -s /opt/jemalloc/lib/* /usr/lib/ && \
-	make -j$(nproc) > /dev/null && \
+	make -j"$(nproc)" > /dev/null && \
 	make install && \
-	cd .. && rm -rf ruby-$RUBY_VER.tar.gz ruby-$RUBY_VER
+	rm -rf ../ruby-$RUBY_VER.tar.gz ../ruby-$RUBY_VER
 
 ENV PATH="${PATH}:/opt/ruby/bin:/opt/node/bin"
 
 RUN npm install -g yarn && \
 	gem install bundler && \
-	apt update && \
-	apt -y install git libicu-dev libidn11-dev \
+	apt-get update && \
+	apt-get install -y --no-install-recommends git libicu-dev libidn11-dev \
 	libpq-dev libprotobuf-dev protobuf-compiler
 
 COPY Gemfile* package.json yarn.lock /opt/mastodon/
@@ -73,7 +56,7 @@ COPY Gemfile* package.json yarn.lock /opt/mastodon/
 RUN cd /opt/mastodon && \
   bundle config set deployment 'true' && \
   bundle config set without 'development test' && \
-	bundle install -j$(nproc) && \
+	bundle install -j"$(nproc)" && \
 	yarn install --pure-lockfile
 
 FROM ubuntu:20.04
@@ -81,7 +64,6 @@ FROM ubuntu:20.04
 # Copy over all the langs needed for runtime
 COPY --from=build-dep /opt/node /opt/node
 COPY --from=build-dep /opt/ruby /opt/ruby
-COPY --from=build-dep /opt/jemalloc /opt/jemalloc
 
 # Add more PATHs to the PATH
 ENV PATH="${PATH}:/opt/ruby/bin:/opt/node/bin:/opt/mastodon/bin"
@@ -89,35 +71,26 @@ ENV PATH="${PATH}:/opt/ruby/bin:/opt/node/bin:/opt/mastodon/bin"
 # Create the mastodon user
 ARG UID=991
 ARG GID=991
-RUN apt update && \
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+RUN apt-get update && \
 	echo "Etc/UTC" > /etc/localtime && \
-	ln -s /opt/jemalloc/lib/* /usr/lib/ && \
-	apt install -y whois wget && \
+	apt-get install -y --no-install-recommends whois wget && \
 	addgroup --gid $GID mastodon && \
 	useradd -m -u $UID -g $GID -d /opt/mastodon mastodon && \
-	echo "mastodon:`head /dev/urandom | tr -dc A-Za-z0-9 | head -c 24 | mkpasswd -s -m sha-256`" | chpasswd
+	echo "mastodon:$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 24 | mkpasswd -s -m sha-256)" | chpasswd && \
+	rm -rf /var/lib/apt/lists/*
 
 # Install mastodon runtime deps
-RUN apt -y --no-install-recommends install \
-	  libssl1.1 libpq5 imagemagick ffmpeg \
+RUN apt-get update && \
+  apt-get -y --no-install-recommends install \
+	  libssl1.1 libpq5 imagemagick ffmpeg libjemalloc2 \
 	  libicu66 libprotobuf17 libidn11 libyaml-0-2 \
-	  file ca-certificates tzdata libreadline8 && \
-	apt -y install gcc && \
+	  file ca-certificates tzdata libreadline8 gcc tini && \
 	ln -s /opt/mastodon /mastodon && \
 	gem install bundler && \
 	rm -rf /var/cache && \
 	rm -rf /var/lib/apt/lists/*
 
-# Add tini
-ENV TINI_VERSION="0.19.0"
-RUN dpkgArch="$(dpkg --print-architecture)" && \
-	ARCH=$dpkgArch && \
-	wget https://github.com/krallin/tini/releases/download/v${TINI_VERSION}/tini-$ARCH \
-	https://github.com/krallin/tini/releases/download/v${TINI_VERSION}/tini-$ARCH.sha256sum && \
-	cat tini-$ARCH.sha256sum | sha256sum -c - && \
-	mv tini-$ARCH /tini && rm tini-$ARCH.sha256sum && \
-	chmod +x /tini
-
 # Copy over mastodon source, and dependencies from building, and set permissions
 COPY --chown=mastodon:mastodon . /opt/mastodon
 COPY --from=build-dep --chown=mastodon:mastodon /opt/mastodon /opt/mastodon
@@ -140,5 +113,5 @@ RUN cd ~ && \
 
 # Set the work dir and the container entry point
 WORKDIR /opt/mastodon
-ENTRYPOINT ["/tini", "--"]
+ENTRYPOINT ["/usr/bin/tini", "--"]
 EXPOSE 3000 4000