CI: add automatic deployment using py-publish

.gitlab-ci.yml

@@ -13,7 +13,7 @@
       - "templates/lint/check-manifest.yml"  # will do the equivalent of 'tox -e check-manifest'
       - "templates/tests/py3.yml"  # will do the equivalent of 'tox -e py3'
       # - "templates/create-release-on-heptapod.yml"  # this will create a release on heptapod
-      # - "templates/upload-to-pypi.yml"  # on a new mercurial tag (expected to be done with release-new), will push a release on pypi
+      - "templates/upload-to-pypi.yml"  # on a new mercurial tag (expected to be done with release-new), will push a release on pypi
   # uncomment and uses to customize/extend the configuration here if needed
   # (it needs to be at the same level than "- project")
   - ".gitlab-ci-extended.yml"