wip: GITHUB_TOKEN gets set, but shouldn't bet set

.forgejo/workflows/check.yml

@@ -6,7 +6,6 @@ jobs:
     runs-on: ubuntu-latest
     env:
       USER: root
-      GITHUB_TOKEN: ""
     steps:
       - name: Check out repository code
         uses: https://code.forgejo.org/actions/checkout@v4
@@ -20,4 +19,5 @@ jobs:
           name: pub-solar
       - name: Run flake checks
         run: |
+          unset GITHUB_TOKEN
           nix --print-build-logs --verbose --accept-flake-config flake check