Update Dockerfile

Signed-off-by: Shubhangi-dell <shubhangi_srivastava@dell.com>

control_plane/roles/control_plane_ib/files/Dockerfile

@@ -1,4 +1,4 @@
-FROM rockylinux/rockylinux:8.5
+FROM rockylinux/rockylinux:docker_os
 
 RUN dnf install -y epel-release
 RUN dnf install dhcp-server -y \