[CI] set up postgres service in workflow

also makes it use a .env.ci file that uses the correct host name

.woodpecker/workflow.yaml

@@ -13,9 +13,15 @@ steps:
     environment:
       DJANGO_SETTINGS_MODULE: config.settings
       DEPLOYMENT: Test
-      ENV_PATH: .env.test
+      ENV_PATH: .env.ci
     commands:
       - python -m venv venv
       - /bin/bash -c "source venv/bin/activate"
       - python -m pip install --disable-pip-version-check -r requirements/test.txt
       - python -m pytest
+
+services:
+  - name: database
+    image: postgres:17
+    environment:
+      POSTGRES_PASSWORD: teilchensammler