chore: include .github directory in copybara job

PiperOrigin-RevId: 373681589

.github/mistaken-pull-closer.yml

@@ -0,0 +1,16 @@
+# The JSONPath filter expression used to identify which PRs to close.
+# The data filtered is the pull request data along with other metadata passed in
+# by probot.
+# Default behavior: Close all PRs.
+filters:
+  - true
+
+# The message to post to the closed PR.
+commentBody: |
+  Thanks for your contribution!  Unfortunately, we don't use GitHub pull
+  requests to manage code contributions to this repository.  Instead, please
+  see [CONTRIBUTING.md](../blob/master/CONTRIBUTING.md) which provides full
+  instructions on how to get involved.
+
+# Whether to add a label to the closed PR.
+addLabel: false