Description of problem:

Sites with required warning banners can use gnome-shell-extension-heads-up-display to set a notice. However, this notice usually needs to be set in multiple places (/etc/issue.net, cockpit's login screen, etc). If gnome-shell-extension-heads-up-display could read the body text from a known file, I could more easily keep them in sync.

Version-Release number of selected component (if applicable):

How reproducible:
100%

Steps to Reproduce:
1. Look for an easy way to de-dupe NOTICE TO USER messages with gnome-shell-extension-heads-up-display
2.
3.

Actual results:
Need to duplicate (and keep in sync) the message in multiple places

Expected results:
Way to centralize the "notice to users"

Additional info: