Enable build action for PR (elastic#40)

Signed-off-by: hejianpeng <hejianpeng2@huawei.com>

.github/workflows/build.yml

@@ -2,29 +2,30 @@ name: Build
 on:
   push:
     branches:
-      - '*'
+      - "*"
+  pull_request:
+    branches:
+      - "*"
 jobs:
-
   build:
     name: Build
     runs-on: ubuntu-latest
     steps:
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: 1.18
+        id: go
 
-    - name: Set up Go
-      uses: actions/setup-go@v3
-      with:
-        go-version: 1.18
-      id: go
-
-    - name: Check out code into the Go module directory
-      uses: actions/checkout@v3
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v3
 
-    - name: Get dependencies
-      run: |
-        go get -v -t -d ./...
+      - name: Get dependencies
+        run: |
+          go get -v -t -d ./...
 
-    - name: Run tests
-      run: go test -v ./...
+      - name: Run tests
+        run: go test -v ./...
 
-    - name: Build
-      run: go build -v .
+      - name: Build
+        run: go build -v .