ci: extend matrix builds to PG 15, 16, 17, 18

Author: andrielfn

.github/workflows/build-deb.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        pg-version: [17, 18]
+        pg-version: [15, 16, 17, 18]
     steps:
       - uses: actions/checkout@v4
       - name: Get version
@@ -51,7 +51,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        pg-version: [17, 18]
+        pg-version: [15, 16, 17, 18]
     steps:
       - name: Download package
         uses: actions/download-artifact@v4