Send merge requests upstream

Description

From time to time it makes sense to send merge requests upstream to integrate what's currently on the onion-services folder.

Tasks

• Open merge requests upstream for relevant templates, including:
  • Containers.
  • Debian packaging.
  • YAML linting.
  • Python packaging.
  • GitLab release.
  • Spell checking (as discussed at tpo/community/hackweek#21 (comment 3187973)).