docs(README): update README

update README

Signed-off-by: mritd <mritd@linux.com>

Author: mritd

README.md

@@ -1,5 +1,10 @@
 ## Dockerfile
 
+### ⚠️⚠️⚠️ Note: Some build work of docker image is being migrated to earthly, 
+### you may not see the update commit in the current repo.
+### Earthlyfile has better scalability and is more convenient for cross-compilation; 
+### the migrated dockerfle can be viewed in [https://github.com/mritd/autobuild](https://github.com/mritd/autobuild).
+
 This repository contains some dockerfiles of personally created docker images;
 it will be maintained for long periods if necessary.