Change docker build to push to portus too

Signed-off-by: trivernis <trivernis@protonmail.com>

.github/workflows/docker.yml

@@ -13,21 +13,29 @@ jobs:
       - name: Copy Repo Files
         uses: actions/checkout@master
 
-      - name: Publish Docker Image to GPR
-        uses: machine-learning-apps/gpr-docker-publish@master
-        id: docker
+      -
+        name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
         with:
-          IMAGE_NAME: 'user-management-server'
-          DOCKERFILE_PATH: 'Dockerfile'
-          BUILD_CONTEXT: '.'
-          CACHE: true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
 
-      - name: Show outputs of previous step
-        run: |
-          echo "The name:tag of the Docker Image is: $VAR1"
-          echo "The docker image is hosted at $VAR2"
-        env:
-          VAR1: ${{ steps.docker.outputs.IMAGE_SHA_NAME }}
-          VAR2: ${{ steps.docker.outputs.IMAGE_URL }}
+      - name: Login to Portus
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.PORTUS_USERNAME }}
+          password: ${{ secrets.PORTUS_PASSWORD }}
+
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: |
+            flotte-docker-registry.spdns.org/flotte-user-managment:latest
+            ghcr.io/flotte-meets-hwr-db/flotte-user-management/user-management-server