adjust the GitHub test workflow to use a test matrix for PostgreSQL versions 15 to 18

Author: ThoSap

.github/workflows/test.yml

@@ -5,9 +5,13 @@ on:
 
 jobs:
   test:
-    name: Tests
+    name: Tests (PostgreSQL ${{ matrix.postgres-version }})
     runs-on: ubuntu-24.04
     timeout-minutes: 5
+    strategy:
+      fail-fast: false
+      matrix:
+        postgres-version: [ 15, 16, 17, 18 ]
     steps:
       - uses: actions/checkout@v5
       - uses: aboutbits/github-actions-java/setup-with-gradle@v4
@@ -20,6 +24,7 @@ jobs:
           --console=colored
           :operator:test
           --fail-fast
+          -Dquarkus.test.profile=test-pg${{ matrix.postgres-version }}
         env:
           GITHUB_USER_NAME: ${{ github.actor }}
           GITHUB_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}