Add a container definition for Rocky Linux 9.3 #62

Job	Run time
build (centos, 7, centos-7, centos-7/Containerfile)	29s
build (rockylinux, 8, rockylinux-8, rockylinux-8/Containerfile)	1s
build (rockylinux, 8.6, rockylinux-8, rockylinux-8/Containerfile-8.6)	9s
build (rockylinux, 8.7, rockylinux-8, rockylinux-8/Containerfile-8.7)	7s
build (rockylinux, 8.8, rockylinux-8, rockylinux-8/Containerfile-8.8)	2s
build (rockylinux, 8.9, rockylinux-8, rockylinux-8/Containerfile-8.9)	3s
build (rockylinux, 9, rockylinux-9, rockylinux-9/Containerfile)	1s
build (rockylinux, 9.0, rockylinux-9, rockylinux-9/Containerfile-9.0)	1s
build (rockylinux, 9.1, rockylinux-9, rockylinux-9/Containerfile-9.1)	1s
build (rockylinux, 9.2, rockylinux-9, rockylinux-9/Containerfile-9.2)	1s
build (rockylinux, 9.3, rockylinux-9, rockylinux-9/Containerfile-9.3)	1s
build (leap, 15, leap, leap/Containerfile.15)	28s
build (leap, latest, leap, leap/Containerfile)	24s
	1m 48s

Provide feedback