chore(yamllint): add and integrate yamllint

1 job for !37 with topic/default/yamllint in 21 seconds (queued for 37 seconds)
latest detached
Status Job ID Name Coverage
  Lint
failed yamllint #153581

00:00:21

 
Name Stage Failure
failed
yamllint Lint
./.gitlab-ci.yml
113:3 error wrong indentation: expected 4 but found 2 (indentation)

ERROR: InvocationError for command /builds/open-source/logilab-common/.tox/yamllint/bin/yamllint . (exited with code 1)
___________________________________ summary ____________________________________
ERROR: yamllint: commands failed
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: command terminated with exit code 1