fix build_test workflow

.github/workflows/build_test.yml

@@ -2,9 +2,13 @@ on: [push, pull_request]
 name: Build Test
 jobs:
   build_test_v2:
+    env:
+      GOPATH: ${{ github.workspace }}
+      GO111MODULE: off
     strategy:
       matrix:
         go-version: [1.16.x, 1.17.x]
+    runs-on: ubuntu-20.04
     steps:
     - name: Install Go
       uses: actions/setup-go@v2
@@ -31,6 +35,7 @@ jobs:
     strategy:
       matrix:
         go-version: [1.16.x, 1.17.x]
+    runs-on: ubuntu-20.04
     steps:
     - name: Install Go
       uses: actions/setup-go@v2