fix ghcr.io login

Signed-off-by: Daniel Holbach <daniel@weave.works>

.github/workflows/on-main-push.yaml

@@ -33,7 +33,7 @@ jobs:
         uses: docker/login-action@v1
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
+          username: weave-ghcr-bot
           password: ${{ secrets.KURED_WEAVE_GHCR_BOT_TOKEN }}
 
       - name: Build image

.github/workflows/on-tag.yaml

@@ -41,7 +41,7 @@ jobs:
         uses: docker/login-action@v1
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
+          username: weave-ghcr-bot
           password: ${{ secrets.KURED_WEAVE_GHCR_BOT_TOKEN }}
 
       - name: Publish image