.gitlab: add issue template for notifying maintainers of o-o-d kernels

Signed-off-by: Aster Boese <asterboese@mailbox.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8579>

.gitlab/issue_templates/Out_of_date_community_kernels.md

@@ -0,0 +1,22 @@
+<!-- Use this template to notify community kernel maintainers that their
+     kernels are out-of-date and start the timer for moving them to testing.
+-->
+
+Hi, as per our
+[device categorization requirements for the community category](https://docs.postmarketos.org/pmaports/main/device-categorization.html#community),
+devices in the community category may not use a kernel version older than 6
+months.
+
+As of today (dd-mm-yyyy), the following kernels do not meet this requirement:
+
+* kernel-pkgname: kernel-pkgver, version-release-date (maintainers: @ ...)
+
+This issue is an attempt to notify you (the maintainers) of the situation so
+that you can update the packages. As per the rules, you have two weeks to
+update the packages or reply with a request for more time, up to one month
+of time from the moment this issue is opened. If that time passes and the
+devices still no longer meet the requirements, they will be moved to testing.
+
+/label ~"device-category::community"
+/label ~kernel
+/label ~"type::policy"