Update docker-image.yml

Author: SamuelTallet

.github/workflows/docker-image.yml

@@ -21,8 +21,11 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: docker login
+      env:
+        DOCKER_USER: ${{ env.DOCKER_USER }}
+        DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
       run: |
-        docker login -u ${{ env.DOCKER_USER }} -p ${{ secrets.DOCKER_PASSWORD }}
+        docker login -u $DOCKER_USER -p $DOCKER_PASSWORD
         
     - name: docker build
       run: docker build . --file Dockerfile --tag ${{ env.DOCKER_USER }}/${{ env.DOCKER_REPO }}:latest