Merge pull request #12 from cats-oss/add-action

dogfooding: Enable this action to this repository

Author: tetsuharuohzeki

.github/main.workflow

@@ -0,0 +1,9 @@
+workflow "Detect unmergeable PRs" {
+  on = "push"
+  resolves = ["detect_unmergeable_pull_request_and_mark_them"]
+}
+
+action "detect_unmergeable_pull_request_and_mark_them" {
+  uses = "cats-oss/github-action-detect-unmergeable@application-code"
+  secrets = ["GITHUB_TOKEN"]
+}