Update ghcr login

.github/workflows/docker.yml

@@ -8,6 +8,10 @@ on:
     paths-ignore:
       - '**.md'
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -32,8 +36,8 @@ jobs:
       - name: log in to ghcr
         uses: docker/login-action@v1
         with:
-          registry: ghcr.io
-          username: lus
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
           password: ${{ secrets.CR_TOKEN }}
       - name: build and push
         uses: docker/build-push-action@v2