dentarg/postgres is an composite run steps action that starts PostgreSQL in the GitHub Actions VM and creates a user and a database. You can then connect to the database using the address found in environment variable POSTGRES_URL.

jobs: build: runs-on: ubuntu-lateststeps: - uses: dentarg/postgres@v1 - run: <your test command>env: DATABASE_URL: "${{env.POSTGRES_URL }}"# or use POSTGRES_URL directly

See the GitHub Actions Virtual Environments repo to understand what version of PostgreSQL will be used.