added test unused function in main and run staticcheck step to ci.yml

Author: epenick123

.github/workflows/ci.yml

@@ -37,4 +37,7 @@ jobs:
         run: test -z $(go fmt ./...)
 
       - name: Install staticcheck
-        run: go install honnef.co/go/tools/cmd/staticcheck@latest
+        run: go install honnef.co/go/tools/cmd/staticcheck@latest
+      
+      - name: Run staticcheck
+        run:  staticcheck ./...

main.go

@@ -96,3 +96,8 @@ func main() {
 	log.Printf("Serving on port: %s\n", port)
 	log.Fatal(srv.ListenAndServe())
 }
+
+func unused() {
+	// this function does nothing
+	// and is called nowhere
+}