DROP: Rework Docker Build Action

.github/workflows/docker.yaml

@@ -1,19 +1,7 @@
 ---
 name: Docker Build Action
 on:
-  pull_request:
-    branches:
-      - master
-  release:
-    types:
-      - published
   push:
-    branches:
-      - master
-
-env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
 
 jobs:
   build:
@@ -24,7 +12,7 @@ jobs:
     - name: Log in to the container registry
       uses: docker/login-action@v3
       with:
-        registry: ${{ env.REGISTRY }}
+        registry: ghcr.io
         username: ${{ secrets.DOCKER_REGISTRY_USER }}
         password: ${{ secrets.DOCKER_REGISTRY_TOKEN }}
 
@@ -33,15 +21,9 @@ jobs:
       with:
         ref: ${{ github.event.pull_request.head.sha }}
 
-    - name: Make tag
-      run: |
-        [ "${GITHUB_EVENT_NAME}" == 'pull_request' ] && echo "tag=${GITHUB_HEAD_REF##*/}" >> $GITHUB_ENV || true
-        [ "${GITHUB_EVENT_NAME}" == 'release' ] && echo "tag=${GITHUB_REF##*/}" >> $GITHUB_ENV || true
-        [ "${GITHUB_EVENT_NAME}" == 'push' ] && echo "tag=latest" >> $GITHUB_ENV || true
-
     - name: Build and push image
       uses: docker/build-push-action@v5
       with:
         context: .
         push: true
-        tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.tag }}
+        tags: ghcr.io/metal-stack/external-dns-management:powerdns