Add upgrade from a previous commit

[maniackcrudelis]

Problem

• Test an upgrade for each PR is boring...

Solution

• Add a test "Upgrade from commit" in the check_process

PR Status

Work finished. Package_check, basic tests and upgrade from last version OK.
Could be reviewed and tested.

Validation

---

Minor decision

• Upgrade previous version :
• [x] Code review : Kay0u
• [x] Approval (LGTM) : Josué
• [x] Approval (LGTM) : Kay0u
• CI succeeded :
  When the PR is mark as ready to merge, you have to wait for 3 days before really merge it.

[maniackcrudelis]

Please this PR need some love

[maniackcrudelis]

The CI failed for an unknow error on this app. It works when I tested myself.

I'm going to run another test, but maybe we could add some other package check test with a log.

[maniackcrudelis]

I can't reproduce the error from the CI. So, here a log of an execution of package check on a VM. https://paste.yunohost.org/quxoroluze

[maniackcrudelis]

Huh yeah sorry, old PR, we can get rid of it now, #43 does the job.