Set GOTOOLCHAIN environment variable to local in CI workflow

Changelog: other

.gitea/workflows/ci.yml

@@ -9,6 +9,8 @@ jobs:
     runs-on: docker
     container:
       image: gitea.jeanlucmakiola.de/makiolaj/docker-node-and-go:latest
+    env:
+      GOTOOLCHAIN: local
     steps:
       - name: Checkout code
         uses: actions/checkout@v6