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