Add race tests

Author: edoardottt

.github/workflows/go.yml

@@ -16,10 +16,13 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.17
+        go-version: 1.18
 
     - name: Build
       run: go build -v ./...
 
     - name: Test
-      run: go test -v ./...
+      run: go test -v ./...
+
+    - name: Race
+      run: go build -race ./...