Research what solution to use for the freezable APT repository

The first step is to specify when we want to import foreign packages into which suites, propose something and lead this discussion to a conclusion. Then we can evaluate if we can use reprepro, have a look at aptly and at what other are doing it.

Parent Task: #5926 (closed)

Subtasks

• #6295 (closed)
• #7427 (closed)
• #6906 (closed)
• #9488 (closed)

Related issues

• Related to #9508 (closed)

Original created by @intrigeri on 9487 (Redmine)