ci: disable setup-go module cache

The act_runner has no actions/cache backend, so setup-go's cache step
hangs indefinitely instead of failing.

Co-Authored-By: Claude Opus 5 <[email protected]>

.gitea/workflows/release.yml

@@ -18,6 +18,8 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: '1.22'
+          # The runner has no actions/cache backend; leaving this on hangs the step.
+          cache: false
       - run: go vet ./... && go test -race ./...
 
   build: