Run golangci-lint without fixing in CI

Running with fixes enabled (which we have in the config) means
golangci-lint returns silently with success if it managed to fix all its
findings. Disable fixing in CI explicitly to make it error out instead.

Author: scop

.github/workflows/golangci-lint.yml

@@ -16,3 +16,4 @@ jobs:
         uses: golangci/golangci-lint-action@v9.2.0
         with:
           version: latest
+          args: --fix=false