Add CI tests for .deb/.rpm packages that wil be shipped to users about dangerzone HOT 2 OPEN

In order to solve this issue, we propose to add CI tests in the apt-tools-prod / yum-tools-prod repos, that do the exact same checks as our build-deb, install-deb, and build-install-rpm jobs in our ci.yml.

The important difference will be that they will operate on the Debian / Fedora packages that we are adding in the PRs. More specifically they will:

• Checkout the Dangerzone repo.
• Move the Dangerzone .deb/.rpm packages to the correct directories.
• Use env.py build to build an environment where we will install these packages and run Dangerzone.
  • Do not use the --download-pyside6 flag, use the local .rpm instead.
• Test that a conversion runs with the Dangerzone CLI, and that the GUI imports work.

If we enforce passing these checks before merging the PRs, we will be much more confident in our subsequent releases.

from dangerzone.