.github: Enable repo-lockdown bot to refuse GitHub pull requests

Some GitHub users try to open pull requests against the GitHub
mirror. Unfortunate these get ignored until eventually someone
notices and closes the request.

Enable the 'Repo Lockdown' [*] 3rd party bot which can autorespond
to pull requests with a friendly comment, close the request, and
then lock it to prevent further comments.

[*] https://github.com/dessant/repo-lockdown

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-Id: <20200406214125.18538-1-f4bug@amsat.org>
[AJB: s/fill/file/ and point at canonical qemu.org/contribute]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
diff --git a/.github/lockdown.yml b/.github/lockdown.yml
new file mode 100644
index 0000000..9acc393
--- /dev/null
+++ b/.github/lockdown.yml
@@ -0,0 +1,34 @@
+# Configuration for Repo Lockdown - https://github.com/dessant/repo-lockdown
+
+# Close issues and pull requests
+close: true
+
+# Lock issues and pull requests
+lock: true
+
+issues:
+  comment: |
+    Thank you for your interest in the QEMU project.
+
+    This repository is a read-only mirror of the project's master
+    repostories hosted on https://git.qemu.org/git/qemu.git.
+    The project does not process issues filed on GitHub.
+
+    The project issues are tracked on Launchpad:
+    https://bugs.launchpad.net/qemu
+
+    QEMU welcomes bug report contributions. You can file new ones on:
+    https://bugs.launchpad.net/qemu/+filebug
+
+pulls:
+  comment: |
+    Thank you for your interest in the QEMU project.
+
+    This repository is a read-only mirror of the project's master
+    repostories hosted on https://git.qemu.org/git/qemu.git.
+    The project does not process merge requests filed on GitHub.
+
+    QEMU welcomes contributions of code (either fixing bugs or adding new
+    functionality). However, we get a lot of patches, and so we have some
+    guidelines about contributing on the project website:
+    https://www.qemu.org/contribute/
diff --git a/MAINTAINERS b/MAINTAINERS
index 9d156d7..0559e84 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2833,6 +2833,7 @@
 M: Fam Zheng <fam@euphon.net>
 R: Philippe Mathieu-Daudé <philmd@redhat.com>
 S: Maintained
+F: .github/lockdown.yml
 F: .travis.yml
 F: scripts/travis/
 F: .shippable.yml