dockerfile: Fix bootc container lint for centos

Remove `/var/cache`, `/var/log` and other artifacts generated by rpm
install

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

Dockerfile

@@ -204,6 +204,12 @@ if [[ "${boot_type}" == "uki" ]]; then
     cp /run/packaging/initialize-sealing-tools /usr/bin/initialize-sealing-tools
 fi
 
+# Fix linting for centos
+rm -rf /var/log
+rm -rf /var/lib
+rm -rf /var/cache
+rm -rf /run/rhsm
+
 EORUN
 # Configure the rootfs
 ARG rootfs=""