Add default sieve filter to roundcube

roles/webmail/files/var_www_roundcube_config_global.sieve

+require ["regex", "fileinto", "imap4flags"];
+# Catch mail tagged as Spam, except Spam retrained and delivered to the mailbox
+if allof (header :regex "X-DSPAM-Result" "^(Spam|Virus|Bl[ao]cklisted)$",
+          not header :contains "X-DSPAM-Reclassified" "Innocent") {
+  # Mark as read
+  setflag "\\Seen";
+  # Move into the Junk folder
+  fileinto "Spam";
+  # Stop processing here
+  stop;
+}

roles/webmail/files/var_www_roundcube_plugins_managesieve_config.inc.php

 $config['managesieve_conn_options'] = null;
 
 // default contents of filters script (eg. default spam filter)
-$config['managesieve_default'] = '/etc/dovecot/sieve/global';
+$config['managesieve_default'] = '/var/www/roundcube/config/global.sieve';
 
 // The name of the script which will be used when there's no user script
 $config['managesieve_script_name'] = 'managesieve';

roles/webmail/tasks/roundcube.yml

     group=www-data
     mode=0644
 
+- name: Install global sieve
+  copy: src=var_www_roundcube_config_global.sieve
+    dest=/var/www/roundcube/config/global.sieve
+    owner=root
+    group=www-data
+    mode=0644
+
 - name: Install carddav plugin configuration
   copy: src=var_www_roundcube_plugins_carddav_config.inc.php
     dest=/var/www/roundcube/plugins/carddav/config.inc.php