chore(ci): Add test envs for Ruby 3.1

Dockerfile-3.1

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+FROM ruby:3.1
+
+# throw errors if Gemfile has been modified since Gemfile.lock
+RUN bundle config --global frozen 1
+
+WORKDIR /app
+
+RUN touch /etc/app-env
+
+RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
+RUN apt-get update && apt-get install -y yarn
+
+COPY Gemfile* /app/
+RUN gem install bundler
+RUN bundle install --jobs 4
+
+RUN mkdir /app/log
+
+COPY . /app/
+COPY config/database.docker.yml /app/config/database.yml
+COPY config/site.docker.yml /app/config/site.yml
+
+RUN RAILS_ENV=production bundle exec rake assets:precompile
+
+ENTRYPOINT ["/app/docker-entrypoint.sh"]
+
+EXPOSE 3000
+
+CMD ["rails", "server", "-b", "0.0.0.0"]

test-envs/docker-compose-3.1-mysql.yml

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+version: '3'
+services:
+  db:
+    image: mysql:5.7
+    environment:
+      MYSQL_ALLOW_EMPTY_PASSWORD: 1
+      MYSQL_DATABASE: ${TRACKS_DB:-tracks}
+    volumes:
+      - db-data:/var/lib/mysql
+  web:
+    build:
+      context: ..
+      dockerfile: Dockerfile-3.1
+    environment:
+      # These are set in script/ci-build, so we need to pass-thru them.
+      RAILS_ENV: $RAILS_ENV
+      DATABASE_NAME: $DATABASE_NAME
+      DATABASE_USERNAME: root
+      DATABASE_PASSWORD_EMPTY: 1
+    volumes:
+      - ${VOLUME:-..}:/app:Z
+      - ${VOLUME:-..}/config/database.docker.yml:/app/config/database.yml:Z
+      - ${VOLUME:-..}/config/site.docker.yml:/app/config/site.yml:Z
+    ports:
+      - 3000:3000
+    depends_on:
+      - db
+volumes:
+  db-data:

test-envs/docker-compose-3.1-postgres.yml

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+version: '3'
+services:
+  db:
+    image: postgres:13
+    environment:
+      POSTGRES_DB: ${DATABASE_NAME:-tracks}
+      POSTGRES_PASSWORD: password
+    volumes:
+      - db-data:/var/lib/postgresql/data
+  web:
+    build:
+      context: ..
+      dockerfile: Dockerfile-3.1
+    environment:
+      # These are set in script/ci-build, so we need to pass-thru them.
+      RAILS_ENV: $RAILS_ENV
+      DATABASE_NAME: $DATABASE_NAME
+      DATABASE_USERNAME: postgres
+      DATABASE_PASSWORD: password
+      DATABASE_TYPE: postgresql
+      DATABASE_ENCODING: unicode
+      DATABASE_PORT: 5432
+    volumes:
+      - ${VOLUME:-..}:/app:Z
+      - ${VOLUME:-..}/config/database.docker.yml:/app/config/database.yml:Z
+      - ${VOLUME:-..}/config/site.docker.yml:/app/config/site.yml:Z
+    ports:
+      - 3000:3000
+    depends_on:
+      - db
+volumes:
+  db-data:

test-envs/docker-compose-3.1-sqlite.yml

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+version: '3'
+services:
+  web:
+    build:
+      context: ..
+      dockerfile: Dockerfile-3.1
+    environment:
+      # These are set in script/ci-build, so we need to pass-thru them.
+      RAILS_ENV: $RAILS_ENV
+      DATABASE_NAME: "/app/db.sqlite"
+      DATABASE_TYPE: sqlite3
+    volumes:
+      - ${VOLUME:-..}:/app:Z
+      - ${VOLUME:-..}/config/database.docker.yml:/app/config/database.yml:Z
+      - ${VOLUME:-..}/config/site.docker.yml:/app/config/site.yml:Z
+    ports:
+      - 3000:3000