ci(gitlab-ci): use templates from a common repository

3 jobs for branch/default in 2 minutes and 20 seconds (queued for 9 minutes and 44 seconds)
Status Name Job ID Coverage
  Lint
passed twine-check #587503
lint twine

00:00:42

passed yamllint #587504
lint yamllint

00:02:02

 
  Tests
passed py3 #587505
tests py3

00:02:19