Add Rocky Linux as an official Library image (#11184)

library/rockylinux

@@ -0,0 +1,9 @@
+Maintainers: The Rocky Linux Foundation <[email protected]> (@rocky_linux)
+GitRepo: https://github.com/rocky-linux/sig-cloud-instance-images.git
+
+Tags: latest, 8, 8.5
+GitFetch: refs/heads/Rocky-8.5-x86_64
+GitCommit: eee13752a34b9195c97d0bce92c05a838484eee8
+arm64v8-GitFetch: refs/heads/Rocky-8.5-aarch64
+arm64v8-GitCommit: df726710f2d759478bea1f06946eb168f4cff17a
+Architectures: amd64, arm64v8