Check tool list syntax + add auto schedule job

Trying to import some CI stuff from .eu/genouest to ease tool maintenance

Things to do/discuss:

• check yml schema
• scheduled task to propose updates in MRs
  • write gitlab-ci stuff
  • create/reuse a gitlab bot account
  • fill PRIVATE_TOKEN vars in CI variables
  • schedule task
• remove preprod branch, always use master and apply on preprod and prod instances? #9 (closed)
• harmonize sections with usegalaxy.* (currently being worked on) #11
• don't parallelize tool install: makes gitlab-ci.yml unreadable + dangerous (conda installs...) #12 (closed)
• synchronise some yml with usegalaxy.eu #10

Fixes #7 (closed)

Fixes #8 (closed)