impose 30s CI timeout to at least make #1343 less bad

.github/workflows/go.yml

@@ -29,7 +29,7 @@ jobs:
 
     # we can't test gpu, xyz, and system on the CI since there is no Vulkan support
     - name: Test
-      run: go test -v $(go list ./... | grep -v gpu | grep -v xyz | grep -v system) -coverprofile cover.out
+      run: go test -v $(go list ./... | grep -v gpu | grep -v xyz | grep -v system) -coverprofile cover.out -timeout 30s
 
     - name: Update coverage report
       uses: ncruces/go-coverage-report@v0