grub: Support including ignition/greenboot and other

This will make it trivial to drop in the other behaviors.

Signed-off-by: Colin Walters <[email protected]>

src/grub2/grub-static.cfg

@@ -59,9 +59,18 @@ function load_video {
   fi
 }
 
-# tracker: https://github.com/coreos/fedora-coreos-tracker/issues/805
-if [ -f $prefix/platform.cfg ]; then
-  source $prefix/platform.cfg
+if [ -f $prefix/ignition.cfg ]; then
+  source $prefix/ignition.cfg
+fi
+if [ -f $prefix/greenboot.cfg ]; then
+  source $prefix/greenboot.cfg
+fi
+# And two arbitrary other files
+if [ -f $prefix/platform01.cfg ]; then
+  source $prefix/platform01.cfg
+fi
+if [ -f $prefix/platform02.cfg ]; then
+  source $prefix/platform02.cfg
 fi
 
 if [ x$feature_timeout_style = xy ] ; then