feat: add remote reusable workflows (#1525)

* feat: add remote reusable workflows

This changes adds cloning of a remote repository to
run a workflow included in it.

Closes #826

* fix: defer plan creation until clone is done

We need wait for the full clone (and only clone once)
before we start to plan the execution for a remote workflow

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

pkg/runner/runner_test.go

@@ -145,7 +145,7 @@ func TestRunEvent(t *testing.T) {
 		{workdir, "uses-composite-with-error", "push", "Job 'failing-composite-action' failed", platforms, secrets},
 		{workdir, "uses-nested-composite", "push", "", platforms, secrets},
 		{workdir, "remote-action-composite-js-pre-with-defaults", "push", "", platforms, secrets},
-		{workdir, "uses-workflow", "push", "reusable workflows are currently not supported (see https://github.com/nektos/act/issues/826 for updates)", platforms, secrets},
+		{workdir, "uses-workflow", "push", "", platforms, map[string]string{"secret": "keep_it_private"}},
 		{workdir, "uses-workflow", "pull_request", "", platforms, map[string]string{"secret": "keep_it_private"}},
 		{workdir, "uses-docker-url", "push", "", platforms, secrets},
 		{workdir, "act-composite-env-test", "push", "", platforms, secrets},