[hotfix] Use `apache` in `README`

README.md

diff --git a/README.md b/README.md
index 2f9d9d5..d92d1b3 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,6 @@
 **Never re-use a tag because it might break CI for older Flink commits.**
 
 ```
-docker build -t chesnay/flink-ci:<tag> base
-docker push chesnay/flink-ci:<tag>
+docker build -t apache/flink-ci:<tag> base
+docker push apache/flink-ci:<tag>
 ```