Use bot token for image push (#127)

Co-authored-by: Balazs Nadasdi <balazs@weave.works>

Author: Callisto13

.github/workflows/release.yml

@@ -20,8 +20,8 @@ jobs:
       uses: docker/login-action@v1
       with:
         registry: ghcr.io
-        username: ${{ secrets.DOCKER_USERNAME }}
-        password: ${{ secrets.DOCKER_PASSWORD }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.QUICK_SILVER_GHCR_BOT_TOKEN }}
     - name: Build docker image
       run: make docker-build TAG=${{ env.TAG }}
     - name: Push docker image