docs: Add links to Linux packages
Description
The README suggests Homebrew as the only supported installation method on Linux, however, glab
exists as a snap package and in many distros' repositories.
Let's mention these as "community-maintained" to suggest we don't offer support for these installation methods. Let's also link to https://repology.org/project/glab-gitlab-cli/versions with an image.
The image can be tweaked to highlight specific versions in red to show we're not supporting them: see minversion.
Related Issues
Resolves #1347 (closed)
How has this been tested?
Screenshots (if appropriate):
The linked image:
[](https://repology.org/project/glab-gitlab-cli/versions)
Renders as:
Types of changes
-
Bug fix (non-breaking change which fixes an issue) -
New feature (non-breaking change which adds functionality) -
Breaking change (fix or feature that would cause existing functionality to change) -
Documentation -
Chore (Related to CI or Packaging to platforms) -
Test gap