Use Gitea registry for base images

.drone.yml

@@ -15,7 +15,7 @@ trigger:
 
 steps:
   - name: install-lint-test
-    image: registry.wtf-eg.net/ki-backend-builder:1.0.0
+    image: git.wtf-eg.de/kompetenzinventar/builder:1.0.2
     commands:
       - pipenv install --dev
       - pipenv run flake8
@@ -91,7 +91,7 @@ trigger:
 
 steps:
   - name: install-lint-test
-    image: registry.wtf-eg.net/ki-backend-builder:1.0.0
+    image: git.wtf-eg.de/kompetenzinventar/builder:1.0.2
     commands:
       - pipenv install --dev
       - pipenv run flake8
@@ -108,6 +108,3 @@ steps:
         from_secret: "docker_username"
       password:
         from_secret: "docker_password"
-
-image_pull_secrets:
-  - dockerconfig