Improved testing

After the initializer scripts were removed, we didn't test the actual compose setup anymore. This adds new tests to run the database migrations.

docker-compose.test.yml

@@ -3,12 +3,13 @@ services:
   netbox:
     image: ${IMAGE-netboxcommunity/netbox:latest}
     depends_on:
-    - postgres
-    - redis
-    - redis-cache
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_started
+      redis-cache:
+        condition: service_started
     env_file: env/netbox.env
-    environment:
-      SKIP_STARTUP_SCRIPTS: ${SKIP_STARTUP_SCRIPTS-false}
     user: 'unit:root'
     volumes:
     - ./configuration:/etc/netbox/config:z,ro
@@ -19,6 +20,11 @@ services:
   postgres:
     image: postgres:15-alpine
     env_file: env/postgres.env
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
   redis:
     image: redis:7-alpine
     command: