Correct checkout path for public workers

As it's different to where it was coming out on self hosted workers

.github/workflows/go-portieris.yaml

@@ -13,6 +13,8 @@ jobs:
     steps:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2
+      with:
+        path: go/src/github.com/IBM/portieris
 
     - name: Setup correct Go version
       uses: actions/setup-go@v2
@@ -22,13 +24,8 @@ jobs:
 
     - name: alltests
       run: |
-        rm -rf /root/go/src/github.com/IBM
-        mkdir -p /root/go/src/github.com/IBM/
-        mv /tmp/github-runner-your-repo/portieris/portieris /root/go/src/github.com/IBM/
-        cd /root/go/src/github.com/IBM/portieris/
-        export PATH=$PATH:/usr/local/go/bin/
-        export GOPATH=$HOME/go
-        export PATH=$PATH:$HOME/go/bin/
+        export GOPATH=$GITHUB_WORKSPACE/go
+        export PATH=$PATH:$GITHUB_WORKSPACE/go/bin/
         export TERM=ansi
+        cd $GITHUB_WORKSPACE/go/src/github.com/IBM/portieris
         make alltests
-        mv /root/go/src/github.com/IBM/portieris/ /tmp/github-runner-your-repo/portieris/