Add AWS SSH key check

Signed-off-by: Webster Mudge <wmudge@cloudera.com>

Author: wmudge

roles/platform/tasks/initialize_aws.yml

@@ -17,4 +17,9 @@
 - name: Retrieve AWS Caller details
   amazon.aws.aws_caller_info:
   register: __aws_caller_info
-  failed_when: __aws_caller_info.account is not defined
+  failed_when: __aws_caller_info.account is not defined
+
+- name: Confirm AWS SSH Public Key ID exists
+  ansible.builtin.command: aws ec2 describe-key-pairs --region "{{ plat__region }}" --key-name "{{ plat__public_key_id }}"
+  register: __aws_ssh_key_pair
+  failed_when: __aws_ssh_key_pair.rc != 0