Add additional CI tests for PostGis20 dialect

Author: peetw

.github/workflows/ci.yml

@@ -54,6 +54,14 @@ jobs:
             DB_INIT: docker run -d -e POSTGRES_PASSWORD=nhsp_test -p 15432:5432 -v ./Tests.NHibernate.Spatial.PostGis20/initdb:/docker-entrypoint-initdb.d postgis/postgis:12-2.5
             TEST_PROJECT: Tests.NHibernate.Spatial.PostGis20
 
+          - DB: PostGis20 (PostgreSQL 12 PostGIS 3.4)
+            DB_INIT: docker run -d -e POSTGRES_PASSWORD=nhsp_test -p 15432:5432 -v ./Tests.NHibernate.Spatial.PostGis20/initdb:/docker-entrypoint-initdb.d postgis/postgis:12-3.4
+            TEST_PROJECT: Tests.NHibernate.Spatial.PostGis20
+
+          - DB: PostGis20 (PostgreSQL 16 PostGIS 3.4)
+            DB_INIT: docker run -d -e POSTGRES_PASSWORD=nhsp_test -p 15432:5432 -v ./Tests.NHibernate.Spatial.PostGis20/initdb:/docker-entrypoint-initdb.d postgis/postgis:16-3.4
+            TEST_PROJECT: Tests.NHibernate.Spatial.PostGis20
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4