add build_test to github action

.github/workflows/build_test.yml

@@ -0,0 +1,43 @@
+on: [push, pull_request]
+name: Build Test
+jobs:
+  build_test_v2:
+    strategy:
+      matrix:
+        go-version: [1.16.x, 1.17.x]
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Get dependencies
+      if: runner.os != 'Windows'
+      run: |
+        if ! command -v dep &>/dev/null; then
+          mkdir -p $GOPATH/bin
+          curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
+          echo "PATH=$GOPATH/bin:$PATH" >> $GITHUB_PATH
+        fi
+        cd $GOPATH/src/github.com/shirou/gopsutil
+        dep ensure
+        # exclude v3 from being run with ./...
+        rm -rf $GOPATH/src/github.com/shirou/gopsutil/v3
+    - name: Build Test v2
+      run: |
+        make build_test
+  build_test_v3:
+    strategy:
+      matrix:
+        go-version: [1.16.x, 1.17.x]
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Build Test v3
+      run: |
+        cd v3 && make build_test