GitHub Actions VMs have PostgreSQL installed

Since June 2020: actions/runner-images#212 (comment)

- https://github.com/actions/virtual-environments/blob/854d90d2058963f1e3cc0c7c404857aa9c898910/images/linux/Ubuntu1804-README.md#databases
- https://github.com/actions/virtual-environments/blob/854d90d2058963f1e3cc0c7c404857aa9c898910/images/linux/Ubuntu2004-README.md#databases

The code:

- actions/runner-images@3be17cf
- https://github.com/actions/virtual-environments/blob/854d90d2058963f1e3cc0c7c404857aa9c898910/images/linux/scripts/installers/postgresql.sh

Earlier in 2020, client and libpq was installed:

- actions/runner-images#12
- actions/runner-images#29

.github/workflows/ci.yml

@@ -7,30 +7,15 @@ on:
 
 jobs:
   build:
-    services:
-      postgres:
-        image: postgres:11
-        env:
-          # https://github.com/docker-library/docs/blob/master/postgres/README.md#environment-variables
-          POSTGRES_PASSWORD: postgres
-        ports:
-        # will assign a random free host port
-        - 5432/tcp
-        # tmpfs makes DB faster by using RAM
-        options: >-
-          --mount type=tmpfs,destination=/var/lib/postgresql/data
-          --health-cmd "pg_isready"
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
     runs-on: ubuntu-latest
     steps:
+    - run: sudo systemctl start postgresql.service
+    - run: sudo -u postgres createuser --createdb ${USER}
+    - run: createdb ${USER}
+    - run: echo "::set-env name=TEST_DATABASE_URL::postgres://localhost/${USER}"
+
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1
       with:
         bundler-cache: true
     - run: bundle exec rake
-      env:
-        # use localhost for the host here because we are running the job on the VM
-        # get randomly assigned published port
-        TEST_DATABASE_URL: "postgres://postgres:postgres@localhost:${{ job.services.postgres.ports[5432] }}/postgres"