Feat adjust github pipeline for docker frontend artifacts

This should allow to use docker building the frontend artifacts and
reusing them in the bare metal release.

.github/workflows/ci.yml

@@ -144,35 +144,8 @@ jobs:
           cd src/
           coveralls --service=github
 
-  frontend:
-    runs-on: ubuntu-20.04
-    steps:
-    -
-      name: Checkout
-      uses: actions/checkout@v2
-    -
-      uses: actions/setup-node@v2
-      with:
-        node-version: '15'
-    -
-      name: Configure version on dev branches
-      if: startsWith(github.ref, 'refs/heads/feature-') || github.ref == 'refs/heads/dev'
-      run: |
-        git_hash=$(git rev-parse --short "$GITHUB_SHA")
-        git_branch=${GITHUB_REF#refs/heads/}
-        sed -i -E "s/version: \"(.*)\"/version: \"${git_branch} ${git_hash}\"/g" src-ui/src/environments/environment.prod.ts
-    -
-      name: Build frontend
-      run: ./compile-frontend.sh
-    -
-      name: Upload artifact
-      uses: actions/upload-artifact@v2
-      with:
-        name: frontend-compiled
-        path: src/documents/static/frontend/
-
   build-release:
-    needs: [frontend, documentation, tests, whitespace, codestyle]
+    needs: [build-docker-image, documentation, tests, whitespace, codestyle]
     runs-on: ubuntu-20.04
     steps:
       -
@@ -183,6 +156,10 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: 3.7
+    -
+      uses: actions/setup-node@v2
+      with:
+        node-version: '15'
       -
         name: Install dependencies
         run: |
@@ -282,7 +259,7 @@ jobs:
   build-docker-image:
     if: github.event_name == 'push' && (startsWith(github.ref, 'refs/heads/feature-') || github.ref == 'refs/heads/dev' || startsWith(github.ref, 'refs/tags/ng-'))
     runs-on: ubuntu-latest
-    needs: [frontend, tests, whitespace, codestyle]
+    needs: [tests, whitespace, codestyle]
     steps:
       -
         name: Prepare
@@ -303,12 +280,6 @@ jobs:
       -
         name: Checkout
         uses: actions/checkout@v2
-      -
-        name: Download frontend artifact
-        uses: actions/download-artifact@v2
-        with:
-          name: frontend-compiled
-          path: src/documents/static/frontend/
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
@@ -344,3 +315,13 @@ jobs:
         name: Inspect image
         run: |
           docker buildx imagetools inspect ${{ steps.prepare.outputs.inspect_tag }}
+      -
+        name: Export frontend artifact from docker
+        run: |
+          docker cp ${{ steps.prepare.outputs.tags }}:/src/src/documents/static/frontend/ src/documents/static/frontend/
+      -
+        name: Upload frontend artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: frontend-compiled
+          path: src/documents/static/frontend/