ci: Use docker/login-action@v2 and secrets.GITHUB_TOKEN

to login to ghcr.io, taking advantage of Github Automatic token
authentication.

Author: boite

.github/workflows/production.yml

@@ -21,8 +21,12 @@ jobs:
       with:
         fetch-depth: 0
 
-    - name: GHCR login
-      run: echo ${{ secrets.DOCKER_PASSWORD }} | docker login ghcr.io --username automation@linkorb.com --password-stdin
+    - name: Login to Container Registry ghcr.io
+      uses: docker/login-action@v2
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
 
     #php7
     #tag with temp tag to make sure trivy scans the new version