also switch ci for go images to checkout@v2

.github/workflows/dockerimage.yml

@@ -13,7 +13,7 @@ jobs:
   build_go_image:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Build the Docker image
       run:  docker build --rm -f build.go/Dockerfile -t build.go:latest build.go