Feat- Add role for managing SSH host keys

• Ensure the /tmp/ssh_keys directory exists.
• Download SSH host keys from S3 and unpack them to /etc/ssh.
• Restart the SSH service to apply the new keys.
• Add necessary variables for S3 and AWS credentials in groupvars/all.
• Include ssh_host_keys role in cluster.yml playbook.

ansible/group_vars/all

@@ -33,3 +33,11 @@
     - /gpfs4
     - /gpfs5
 
+#SSH Host Keys
+  S3_ENDPOINT: ""
+  SSH_HOST_KEYS_S3_BUCKET: ""
+  SSH_HOST_KEYS_S3_OBJECT: ""
+
+# AWS credentials
+  LTS_ACCESS_KEY: ""
+  LTS_SECRET_KEY: ""