try separate build / push

.github/workflows/ci.yml

@@ -84,9 +84,7 @@ jobs:
 
   # build and push image to docker hub.
   build-docker-image:
-    if: github.event_name == 'push' && (github.ref == 'refs/heads/travis-multiarch-builds' || github.ref == 'refs/heads/master' || github.ref == 'refs/heads/dev' || github.ref == 'refs/tags/ng-*')
     runs-on: ubuntu-latest
-    needs: tests
     steps:
       -
         name: Prepare
@@ -118,19 +116,10 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
       -
-        name: Login to DockerHub
+        name: Build image
-        uses: docker/login-action@v1
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
-      -
-        name: Build and push
         uses: docker/build-push-action@v2
         with:
-          context: .
-          file: ./Dockerfile
           platforms: linux/amd64,linux/arm/v7
-          push: true
           tags: jonaswinkler/paperless-ng:${{ steps.prepare.outputs.version }}
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache
@@ -138,3 +127,35 @@ jobs:
         name: Inspect image
         run: |
           docker buildx imagetools inspect jonaswinkler/paperless-ng:${{ steps.prepare.outputs.version }}
+
+  push-docker-image:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && (github.ref == 'refs/heads/travis-multiarch-builds' || github.ref == 'refs/heads/master' || github.ref == 'refs/heads/dev' || github.ref == 'refs/tags/ng-*')
+    needs: [tests, build-docker-image]
+
+    steps:
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Cache Docker layers
+        uses: pat-s/always-upload-cache@v2.1.3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      -
+        name: Push image
+        uses: docker/build-push-action@v2
+        with:
+          platforms: linux/amd64,linux/arm/v7
+          tags: jonaswinkler/paperless-ng:${{ steps.prepare.outputs.version }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          push: true