Login to ghcr.io to push images

Author: mpe

.github/workflows/deploy.yml

@@ -25,8 +25,12 @@ jobs:
       - name: Build docker image
         run: make -C build rebuild-image@$SUBARCH@$IMAGE
 
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: linuxppc
+          password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Push docker image
-        env:
-          DOCKER_USER: ${{ secrets.DOCKER_USER }}
-          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
         run: make -C build push-image@$SUBARCH@$IMAGE