use current user

Author: eedygreen

.github/workflows/deploy_testnet.yml

@@ -37,8 +37,8 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GHCR_TOKEN }}
 
       - name: build / tag / push docker image into ghcr
         id: build-and-push-tag