Postgres and Redis container services for e2e tests in GitHub actions

End-to-end tests should use a real database connection, and provisioning container service for the Postgres database can be automated using GitHub actions. The environment variable for the connection string for the newly created database can be set in the step for running e2e tests. The same goes for the Redis instance.

# ...
jobs:
  build:
    # Container must run in Linux-based operating systems
    runs-on: ubuntu-latest
    # Image from Docker hub
    container: node:20.9.0-alpine3.17
    # ...
    strategy:
      matrix:
        # ...
        database-name:
          - e2e-testing-db
        database-user:
          - username
        database-password:
          - password
        database-host:
          - postgres
        database-port:
          - 5432
        redis-host:
          - redis
        redis-port:
          - 6379

    services:
      postgres:
        image: postgres:latest
        env:
          POSTGRES_DB: ${{ matrix.database-name }}
          POSTGRES_USER: ${{ matrix.database-user }}
          POSTGRES_PASSWORD: ${{ matrix.database-password }}
        ports:
          - ${{ matrix.database-port }}:${{ matrix.database-port }}
        # Set health checks to wait until postgres has started
        options: --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

      redis:
        image: redis
        # Set health checks to wait until redis has started
        options: >-
          --health-cmd "redis-cli ping"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

    steps:
      # ...
      - run: npm run test:e2e
        env:
          DATABASE_URL: postgres://${{ matrix.database-user }}:${{ matrix.database-password }}@${{ matrix.database-host }}:${{ matrix.database-port }}/${{ matrix.database-name }}
          REDIS_URL: redis://${{ matrix.redis-host }}:${{ matrix.redis-port }}
      # ...

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