CI: Add PR template

This will inform people that we offer rpm/deb packages for each PR

Author: bastelfreak

.github/pull_request_template.md

@@ -0,0 +1,27 @@
+<!--
+Thank you for contributing to this project!
+
+- This project has a Contributor Code of Conduct: https://voxpupuli.org/coc/
+- Please check that here is no existing issue or PR that addresses your problem.
+- Our vulnerabilities reporting process is at https://voxpupuli.org/security/
+
+- The CI will build rpm and deb packages for openvoxdb & openvox-server. The
+packages will be stored in a zip archive and uploaded as GitHub artifacts.
+In the PR, go to Checks -> main. The archives will be linked at the bottom. It's
+always named openvoxerver/openvoxdb-$(git describe). The artifacts are available for 24
+hours.
+
+-->
+
+#### Pull Request (PR) description
+<!--
+Replace this comment with a description of your pull request.
+-->
+
+#### This Pull Request (PR) fixes the following issues
+<!--
+Replace this comment with the list of issues or n/a.
+Use format:
+Fixes #123
+Fixes #124
+-->