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

5 jobs for branch/default in 2 minutes and 27 seconds (queued for 16 minutes and 57 seconds)
Status Name Job ID Coverage
  Lint
passed twine-check #587625
lint twine

00:01:06

passed yamllint #587656
lint yamllint

00:00:43

failed yamllint #587626
lint yamllint

00:01:31

 
  Tests
passed py3 #587654
py3 tests

00:01:21

failed py3 #587627
tests py3

00:01:24