fix: mount volume for workflow info (#776)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/runner/testdata/actions/docker-local/entrypoint.sh

@@ -3,3 +3,5 @@
 echo "Hello $1"
 time=$(date)
 echo ::set-output name=time::$time
+
+echo "SOMEVAR=$1" >>$GITHUB_ENV

pkg/runner/testdata/local-action-dockerfile/push.yml

@@ -9,4 +9,5 @@ jobs:
     - uses: ./actions/docker-local
       with:
         who-to-greet: 'Mona the Octocat'
+    - run: '[[ "${{ env.SOMEVAR }}" == "Mona the Octocat" ]]'
     - uses: ./localdockerimagetest_