Add build step to build/test/vet the code

.github/workflows/go.yml

@@ -0,0 +1,37 @@
+name: Go
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  go-otel-exporter:
+    runs-on: ubuntu-18.04
+
+    strategy:
+      # if one test fails, do not abort the rest
+      fail-fast: false
+      matrix:
+        include:
+          - go-version: 1.13.x
+          - go-version: 1.14.x
+    steps:
+
+      - name: Set up Go 1.x
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+        id: go
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Build
+        run: go build -v ./...
+
+      - name: Test
+        run: go test -v ./...
+
+      - name: Vet
+        run: go vet ./...