Checkout target branch on smoke tests (#283)

Author: 0x2b3bfa0

.github/workflows/smoke.yml

@@ -30,6 +30,8 @@ jobs:
       SMOKE_TEST_ENABLE_${{ matrix.provider }}: true
     steps:
     - uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha || github.ref }}
     - uses: actions/setup-go@v2
       with:
         go-version: ^1.17
@@ -54,6 +56,8 @@ jobs:
       AZURE_TENANT_ID: ${{ secrets.AZURE_TENANT_ID }}
     steps:
     - uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha || github.ref }}
     - uses: actions/setup-go@v2
       with:
         go-version: ^1.17