Add continuous integration

[ArwynFr]

Also handle the dependency management in order to help people transition to the new workshop item:

phase 1

• [x] add continuous integration on the repository
• [ ] update Cheitan's item to latest version
• [ ] update Cheitan's description to indicate future deprecation

phase 2

• [ ] add the bot's item as a dependency to Cheitan's
• [ ] remove content from Cheitan's

[ArwynFr]

Pending creation of an empty workshop item

[ArwynFr]

Workshop item and CI done ; pending #30