Support for certbot's --deploy-hook option

Allows users of this role to pass a custom argument to certbot's
--deploy-hook option.

README.md

@@ -74,6 +74,12 @@ Services that should be stopped while `certbot` runs it's own standalone server
 
 These services will only be stopped the first time a new cert is generated.
 
+#### Deploy hook
+
+    certbot_deploy_hook:
+
+If not empty, the value of this variable will be used as the argument to certbot's --deploy-hook option.
+
 ### Snap Installation
 
 Beginning in December 2020, the Certbot maintainers decided to recommend installing Certbot from Snap rather than maintain scripts like `certbot-auto`.

defaults/main.yml

@@ -36,6 +36,7 @@ certbot_create_command: >-
   {{ '--webroot-path ' if certbot_create_method == 'webroot'  else '' }}
   {{ cert_item.webroot | default(certbot_webroot) if certbot_create_method == 'webroot' else '' }}
   -d {{ cert_item.domains | join(',') }}
+  {{ '--deploy-hook {}'.format(certbot_deploy_hook) if certbot_deploy_hook else '' }}
   {{ '--pre-hook /etc/letsencrypt/renewal-hooks/pre/stop_services'
     if certbot_create_standalone_stop_services and certbot_create_method == 'standalone'
   else '' }}
@@ -43,6 +44,8 @@ certbot_create_command: >-
     if certbot_create_standalone_stop_services and certbot_create_method == 'standalone'
   else '' }}
 
+certbot_deploy_hook:
+
 certbot_create_standalone_stop_services:
   - nginx
   # - apache