Adds a retry to the URL check whether Cryptpad is available from the public internet

tasks/main.yml

@@ -73,7 +73,12 @@
   become: false
   uri:
     url: "{{ cryptpad_http_unsafe_origin_url }}"
+    return_content: yes
     timeout: 300
     validate_certs: no
+  register: url_check
   delegate_to: localhost
+  until: "'CryptPad: Zero Knowledge' in url_check.content"
+  retries: 5
+  delay: 10
   tags: health