Add postgis to CI setup

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       # Label used to access the service container
       postgres:
         # Docker Hub image
-        image: postgres:12.5-alpine
+        image: postgres:16.2-alpine
         # Provide the password for postgres
         env:
           POSTGRES_USER: postgres
@@ -46,7 +46,6 @@ jobs:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of sonarcloud analysis
 
       - name: Install dependencies
-        # copy postgis.control: postgis installation on Github doesn't put this file in the expected location
         run: |
           sudo apt-get install -qq postgis