fixes #26741 - adds containers support for developers

this patch introduce a docker file and docker compose example
so that developers can easily get a production docker based env
working quickly.

this by no means is a replacement to the installer or should
effect users besides the porpose of getting up an environment quickly

this does not try to solve docker problems for plugins (but it
can be used to build customized images with a custom plugin installed).

to test this pr you would need docker and docker-compose (I'm running docker-compose-1.22.0-2.)

to use this PR:
(install docker-compose)

docker-compose run app bundle exec rake db:create db:migrate db:seed
docker-compose up

in order to build your own docker image you can either use a service
(such as quay.io) tiggered by a git push or manually OR
to install a recent version of docker that supports multi-stage builds

in theory podman also supports it, but i had stability issues with it
while trying to build images.

.dockerignore

@@ -0,0 +1,59 @@
+**/node_modules
+public/webpack
+.git
+.bundle
+~
+db/*.sqlite3*
+log/*.log
+log/*.log.age
+tmp/*
+jenkins/reports/*
+test/reports/*
+db/schema.rb
+db/openid-store
+config/settings.yaml
+config/ignored_environments.yml
+config/settings.plugins.d
+config/database.yml
+config/initializers/local_secret_token.rb
+config/initializers/encryption_key.rb
+coverage/*
+*.sw?
+.idea
+*.pyc
+public/apipie-cache
+public/assets
+.DS_Store
+foreman_client
+doc/
+.rbenv*
+.rvmrc*
+.ruby-version*
+.ruby-gemset*
+locale/*.mo
+locale/*/*.edit.po
+locale/*/*.po.time_stamp
+locale/*/*.pox
+locale/*/LC_MESSAGES
+coverage/
+extras/jumpstart
+tags
+_build
+zeus.json
+custom_plan.rb
+pkg/
+config/hooks
+*.csv
+vendor/ruby
+.env*
+package-lock.json
+npm-debug.log
+.vscode
+.yo-rc.json
+out*
+.byebug_history
+.gitignore
+.dockerignore
+.travis.yml
+docker-compose*.yml
+Gemfile.lock

Dockerfile

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+# Base container that is used for both building and running the app
+FROM fedora:30 as base
+ARG RUBY_MODULE="ruby:2.6"
+ARG NODEJS_MODULE="nodejs:11"
+
+RUN \
+  echo "tsflags=nodocs" >> /etc/dnf/dnf.conf && \
+#  dnf -y upgrade && \
+  dnf -y module install ${RUBY_MODULE} ${NODEJS_MODULE} && \
+  dnf -y install mysql-libs mariadb-connector-c postgresql-libs ruby{,gems} rubygem-{rake,bundler} nc hostname \
+  # needed for VNC/SPICE websockets
+  python python2-numpy && \
+  dnf clean all && \
+  rm -rf /var/cache/dnf/
+
+ARG HOME=/home/foreman
+WORKDIR $HOME
+RUN groupadd -r foreman -f -g 1001 && \
+    useradd -u 1001 -r -g foreman -d $HOME -s /sbin/nologin \
+    -c "Foreman Application User" foreman && \
+    chown -R 1001:1001 $HOME
+
+# Add a script to be executed every time the container starts.
+COPY entrypoint.sh /usr/bin/
+RUN chmod +x /usr/bin/entrypoint.sh
+ENTRYPOINT ["entrypoint.sh"]
+
+# Temp container that download gems/npms and compile assets etc
+FROM base as builder
+ENV RAILS_ENV=production
+ENV FOREMAN_APIPIE_LANGS=en
+ENV BUNDLER_SKIPPED_GROUPS="test development openid libvirt journald"
+
+RUN \
+  dnf -y install redhat-rpm-config git \
+    gcc-c++ make bzip2 gettext \
+    libxml2-devel libcurl-devel ruby-devel \
+    mysql-devel postgresql-devel libsq3-devel && \
+  dnf clean all && \
+  rm -rf /var/cache/dnf/
+
+ENV DATABASE_URL=sqlite3:tmp/bootstrap-db.sql
+
+ARG HOME=/home/foreman
+USER 1001
+WORKDIR $HOME
+COPY --chown=1001:1001 . ${HOME}/
+RUN echo gem '"rdoc"' > bundler.d/container.rb
+RUN bundle install --without "${BUNDLER_SKIPPED_GROUPS}" \
+    --binstubs --clean --path vendor --jobs=5 --retry=3 && \
+  rm -rf vendor/ruby/*/cache/*.gem && \
+  find vendor/ruby/*/gems -name "*.c" -delete && \
+  find vendor/ruby/*/gems -name "*.o" -delete
+RUN npm install --no-optional
+RUN \
+  make -C locale all-mo && \
+  bundle exec rake assets:clean assets:precompile db:migrate &&  \
+  bundle exec rake db:seed apipie:cache:index && rm tmp/bootstrap-db.sql
+RUN ./node_modules/webpack/bin/webpack.js --config config/webpack.config.js && npm run analyze && rm -rf public/webpack/stats.json
+RUN rm -rf vendor/ruby/*/cache vendor/ruby/*/gems/*/node_modules
+
+FROM base
+
+ARG HOME=/home/foreman
+ARG RAILS_ENV=production
+ENV RAILS_SERVE_STATIC_FILES=true
+ENV RAILS_LOG_TO_STDOUT true
+
+USER 1001
+WORKDIR ${HOME}
+COPY --chown=1001:1001 . ${HOME}/
+COPY --from=builder /usr/bin/entrypoint.sh /usr/bin/entrypoint.sh
+COPY --from=builder --chown=1001:1001 ${HOME}/.bundle/config ${HOME}/.bundle/config
+COPY --from=builder --chown=1001:1001 ${HOME}/Gemfile.lock ${HOME}/Gemfile.lock
+COPY --from=builder --chown=1001:1001 ${HOME}/vendor/ruby ${HOME}/vendor/ruby
+COPY --from=builder --chown=1001:1001 ${HOME}/public ${HOME}/public
+RUN echo gem '"rdoc"' > bundler.d/container.rb
+
+RUN date -u > BUILD_TIME
+
+# Start the main process.
+CMD "bundle exec bin/rails server"
+
+EXPOSE 3000/tcp
+EXPOSE 5910-5930/tcp

docker-compose.yml

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+version: '3.4'
+services:
+  db:
+    environment:
+      - MYSQL_USER=foreman
+      - MYSQL_PASSWORD=foreman
+      - MYSQL_DATABASE=foreman
+      - MYSQL_DATADIR_ACTION=upgrade-auto
+    hostname: db.example.com
+    image: centos/mariadb-102-centos7
+    ports:
+      - 3306
+    restart: always
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 3306 || exit 1"]
+      interval: 30s
+      timeout: 30s
+      retries: 3
+    volumes:
+      - db:/var/lib/mysql/data
+
+  app: &app_base
+    image: quay.io/ohadlevy/foreman:containers
+    command: bundle exec bin/rails server -b 0.0.0.0
+    build:
+      context: .
+    environment:
+      - DATABASE_URL=mysql2://foreman:foreman@db:3306/foreman
+      - RAILS_MAX_THREADS=5
+      - RAILS_ENV=production
+    hostname: foreman.example.com
+    links:
+      - db
+    ports:
+      - "${MY_DOCKER_IP:-127.0.0.1}:3000:3000"
+      - "${MY_DOCKER_IP:-127.0.0.1}:5910-5930:5910-5930"
+    restart: always
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 3000 || exit 1"]
+      interval: 5m
+      start_period: 1m
+
+  worker:
+    <<: *app_base
+    command: bundle exec rake dynflow:executor
+    hostname: worker.example.com
+    ports:
+      - 9999
+    healthcheck:
+      test: "ps ax | grep -v grep | grep dynflow_executor"
+      interval: 1m
+      start_period: 1m
+
+volumes:
+  db:

entrypoint.sh

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+#!/bin/bash
+set -e
+
+export PATH=~/bin:${GEM_HOME}/bin:${PATH}
+
+# Remove a potentially pre-existing server.pid for Rails.
+rm -f ~/pids/server.pid
+
+# Then exec the container's main process (what's set as CMD in the Dockerfile).
+exec "$@"