use github token

Author: eedygreen

.github/workflows/deploy_testnet.yml

@@ -38,7 +38,7 @@ jobs:
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GHCR_TOKEN }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: build / tag / push docker image into ghcr
         id: build-and-push-tag