feature: support distros using DNF as their package manager #14
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Some package managers such as dnf and pacman support concepts other than than package name itself, such as groups. These are now specified in the yamls, and parsed correctly. Would be used later in installer implementations.
It includes regular packages and the new group packages. Also completed remaining package mapping for dnd, and marked comaptible distros that use dnf as supported.
For advanced scenarios such as the development-tools group in DNF, our implementation was losing critical information about the package, trying to install it as a single-package rather than as a group. The missing link was to use the package resolver which was built exactly for this purpose, extracting as much info on the package as possible first, then using it to properly install it.
The resolver's job is to translate them to different names per-distro.
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"Development Tools" is a group package in DNF that has different variants between Fedora and CentOS, named `development-tools` in Fedora instead. This creates a complex situation where some packages are not only mapped differently between different package managers, such as apt and dnf, but also between distros on the same package manager. By explicitly providing a mapping per-distro for such packages, we ensure they'll work on specific distros, and error out if no mapping is provided, thus not supporting anything implicitly.
No need to pin a specific version for the latest test
I've never used them so I don't want to take the chance.
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Summary
This PR adds support for DNF driven Linux distros, such as Fedora, RHEL, CentOS, etc.
It does so by following the same patterns as used by APT.
One thing worth mentioning is that DNF supports "group" installs. Unlike APT, which treats everything as packages, even if the package is a "meta" package (collection of other packages), DNF has an explicit concept of groups, which requires explicit support. The abstract package management implementation now supports this new concepts, especially since there are additional package managers with similar capabilities to support next, e.g. arch's pacman