Make etcd node removal idempotent (#12949)

Author: VannTen

roles/remove-node/remove-etcd-node/tasks/main.yml

@@ -21,6 +21,10 @@
       - "{{ bin_dir }}/etcdctl"
       - member
       - remove
-      - "{{ '%x' | format(((etcd_members.stdout | from_json).members | selectattr('peerURLs.0', '==', etcd_peer_url))[0].ID) }}"
+      - "{{ '%x' | format(etcd_removed_nodes[0].ID) }}"
+    vars:
+      etcd_removed_nodes: "{{ (etcd_members.stdout | from_json).members | selectattr('peerURLs.0', '==', etcd_peer_url) }}"
+      # This should always have at most one member, since the etcd_peer_url should be unique in the etcd cluster
+    when: etcd_removed_nodes != []
     register: etcd_removal_output
     changed_when: "'Removed member' in etcd_removal_output.stdout"