update test workflow to include step to build netmaker(linux) and netclient(linux/freebsd/darwin/windows)

.github/workflows/test.yml

@@ -4,6 +4,23 @@ on:
   push:
 
 jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+            go-version: 1.17
+      - name: Build
+        run: |
+         env GOOS=linux GOARCH=amd64 go build main.go
+         cd netclient
+         env GOOS=linux GOARCH=amd64 go build main.go
+         env GOOS=freebsd GOARCH=amd64 go build main.go
+         env GOOS=darwin GOARCH=amd64 go build main.go
+         env GOOS=windows GOARCH=amd64 go build main.go
   tests:
     env:
       DATABASE: sqlite