Run tests for tails-weblate-update.hook

Originally created by @hefee on #16712 (Redmine)

I added tests for tails-weblate-update.hook in files/gitolite/hooks/tests. IMO we should run those tests by Jenkins and/or with puppet.

Initially I thought, that we only can run the tests, if the file has a .py suffix. But enrico showed a way to solve this.

Edited Aug 31, 2020 by intrigeri