docs(readme): mention the CI actions

README.org

@@ -53,8 +53,11 @@ launched. During the initial run, Emacs will automatically install the necessary
 packages.
 
 *** ⚠ Important note
-Please note that I'm using a fresh Emacs (29.0.91 or 30.0.50) built from source
-on a Manjaro Linux system.
+Please note that I'm using a fresh Emacs 29 built from source on a Manjaro Linux
+system. I have enabled basic [[https://github.com/abougouffa/minemacs/actions/workflows/build.yaml][Github CI actions]] to automatically test running
+Emacs on Ubuntu Linux (Emacs 28 and 29), MacOS (Emacs 29) and Windows (Emacs
+28). These actions ensure that MinEmacs is "runnable" on these systems, however,
+more testing should be done to validate the configuration on these systems.
 
 I'm trying to support at least Emacs 28.2, so [[file:core/me-backports-29.el][I back port some of the new
 functions/macros I use to Emacs 28]]. Furthermore, for Emacs 28 and earlier,