rename all yml files to yaml

docker-compose.postgis.yaml

@@ -0,0 +1,13 @@
+services:
+    postgis:
+        container_name: postgis
+        environment:
+        - POSTGRES_DB="${POSTGIS_DATABASE:?}"
+        - POSTGRES_USER="${POSTGIS_USER:?}"
+        - POSTGRES_PASSWORD="${POSTGIS_PASSWORD:?}"
+        image: postgis/postgis:14-3.2
+        ports:
+        - 7654:5432
+        restart: unless-stopped
+        volumes:
+        - /opt/postgis:/var/lib/postgresql/data