Improve certificate existence check by removing bashisms

Author: amotl

tasks/check-existence.yml

@@ -1,7 +1,7 @@
 ---
 - name: Get installed certificates.
   shell: |
-    {{ certbot_script }} certificates | grep "Domains:" | awk '{ gsub(/    Domains: /,""); print }'
+    {{ certbot_script }} certificates
   changed_when: false
   register: letsencrypt_certs
 
@@ -13,4 +13,4 @@
   set_fact:
     cert_exists: true
   when: cert_item.domains | sort | difference(item) == []
-  with_list: "{{ letsencrypt_certs.stdout_lines }}"
+  with_list: "{{ letsencrypt_certs.stdout_lines | select('match', '.*Domains:.*') | map('regex_replace', '^.*Domains: (.*)$', '\\1') }}"