fix: enable CGO for race detector in tests

- Add CGO_ENABLED=1 to CI test step
- Add CGO_ENABLED=1 to Makefile test commands
- Fixes: go: -race requires cgo; enable cgo by setting CGO_ENABLED=1

.github/workflows/ci.yml

@@ -34,6 +34,8 @@ jobs:
         run: go mod verify
 
       - name: Run tests
+        env:
+          CGO_ENABLED: 1
         run: go test -v -race -coverprofile=coverage.out ./...
 
       - name: Upload coverage