PostGIS not available

[Pinnokkio]

steps:
  - uses: actions/checkout@v4
  - uses: ./.github/actions/prepare # Just installs PHP and dependencies
    with:
      token: ${{ secrets.GH_TOKEN }}


  - uses: ikalnytskyi/action-setup-postgres@v7
    id: postgres

  - env:
      PGSERVICE: ${{ steps.postgres.outputs.service-name }}
    run: |
      createuser username
      createdb --owner username postgres_tests
      psql -c "ALTER USER username WITH PASSWORD 'password'"
      psql -c "ALTER USER username WITH SUPERUSER;"


  - name: Run tests
    env:
      DB_CONNECTION: pgsql
      DB_DATABASE: postgres_tests
      DB_PORT: 5432
      DB_USERNAME: username
      DB_PASSWORD: password
    run: php artisan test

It still says PDOException: SQLSTATE[42704]: Undefined object: 7 ERROR: type "geometry" does not exist which means PostGIS is not available in PostgreSQL. Any ideas how to fix this? When running CREATE EXTENSION postgis, I'm getting an error:

ERROR:  extension "postgis" is not available
DETAIL:  Could not open extension control file "/usr/share/postgresql/[17](https://github.com/.../.../actions/runs/12208658718/job/34061268966?pr=549#step:5:18)/extension/postgis.control": No such file or directory.
HINT:  The extension must first be installed on the system where PostgreSQL is running.
Error: Process completed with exit code 1.

Thanks in advance.