New bot: Undersightable

To check health status of various things. For example, to check that released tarballs are ok so that we notice issues like this faster.

⚠ Feel free to edit this list

Checks that need to be implemented:

• Websites are up
• Tarballs are uploaded and are not changed
  • Rakudo
  • NQP
  • MoarVM
  • Rakudo Star
• GPG signature is correct
• sha256 sum is correct (Rakudo Star only)
• Rakudo, NQP, MoarVM CI status
• All IRC bots are up
• Debian buildd page looks alright
• Number of severe tickets
• Check that latest moarvm release is mentioned on https://moarvm.org/
• Check that latest rakudo release is mentioned on https://en.wikipedia.org/wiki/Rakudo_Perl_6
• Check that latest rakudo Star is mentioned on https://en.wikipedia.org/wiki/Rakudo_Perl_6

From release guide:

• Check if any DEPRECATED code needs to be removed because the end of the deprecation cycle is reached. One way of doing this, is to grep on the YYYYMM of the release (e.g. 201412 for the 2014.12 release). (just grep for things that look like deprecations)
• If it’s a month relatively early in the calendar year, double-check that the copyright date (check copyright dates in all repos)

No source file, test, or bot entry point is named. Start by reviewing the unchecked checks and the referenced docs/release_guide.pod, then determine the scope for one check; done means the selected health check is implemented and reports failures clearly.