fix ci: add GH_REPO env var so gh doesnt need git context

Author: MochiOS Team

.github/workflows/build-iso.yml

@@ -81,6 +81,7 @@ jobs:
       - name: publish release
         env:
           GH_TOKEN: ${{ github.token }}
+          GH_REPO: ${{ github.repository }}
         run: |
           cd /tmp/iso
           iso=$(ls *.iso 2>/dev/null | head -1)