ci: migrate rockylinux base image

> The Docker team curates the Official Images program,
and there are currently some technical constraints preventing
Rocky Linux from publishing updates here. For the most
up-to-date container images, please refer to the Rocky Linux
Docker Hub repository for now.

ref: https://hub.docker.com/_/rockylinux

Author: Mizux

ci/docker/rockylinux/Dockerfile

@@ -1,6 +1,6 @@
 # Create a virtual environment with all tools installed
-# ref: https://hub.docker.com/_/rockylinux
-FROM rockylinux:9 AS env
+# ref: https://hub.docker.com/rockylinux/rockylinux
+FROM rockylinux/rockylinux:9 AS env
 
 # Install system build dependencies
 ENV PATH=/usr/local/bin:$PATH