Snap package needs system-files plug for issue list command to work

Description

On Ubuntu 20.04, with glab 1.14.0-16-g222c0c51, the glab issue list command fails due to missing permissions.

It seems that glab is trying to access /etc/gitconfig. However, it cannot in a non --classic install (as recommended in the glab documentation), as the snap only has access to files in the user's home directory.

Expected Behavior vs Actual Behavior

• Expected: glab issue list works after successful authentication
• Actual: glab issue list fails with the following error:

warning: unable to access '/etc/gitconfig': Permission denied

Possible Fix

1. Provide a system-files plug for the snap
2. Recommend to install with sudo snap install glab --edge --classic => does not work either
3. Remove the snap and install the .deb package instead

Steps to Reproduce

$ glab issue list
warning: unable to access '/etc/gitconfig': Permission denied
warning: unable to access '/etc/gitconfig': Permission denied
fatal: unknown error occurred while reading the configuration files
git: exit status 128

$ sudo snap connect glab:system-files
error: snap "glab" has no plug named "system-files"

Logs

See above

Your Environment

• Version used (Run glab --version): 1.14.0-16-g222c0c51
• Operating System and version: Ubuntu 20.04