[TECHNICAL] Add workflow to test upgrade from "latest" to current

[jesmrec]

Related Issues

Update testing is required to every release pre-QA stage, to assure that the new build will migrate correctly over the existing version. The current pull request automates such process.

In this first version, this is the process:

• Build latest and current by using a matrix that will run both in parallel
• Once both are done, the test hosted here will run:
  • Install latest version
  • Log in and enable security
  • Install current over that
  • Checks that the security is asked, the list of files is correct, and the commit hash is correctly displayed in Settings.

For sure, more assertions and checks could be added to have a more accurate testing.

As artifacts:

• Both apks (retention of 1 day)
• Execution log, from test repository
• Crash log, if needed
• Recoding video

App:

• Add changelog files for the fixed issues in folder changelog/unreleased. More info here
• Add feature to Release Notes in ReleaseNotesViewModel.kt creating a new ReleaseNote() with String resources (if required)

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QA

[joragua]

Some comments here @jesmrec

[joragua]

LGTM! Good job 💯