Add deploy to github container registry

Author: adribaeza

.github/workflows/build-docker-images.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.GHCR_TOKEN }}
 
       - name: Build and push backend Docker image
         uses: docker/build-push-action@v3