[Docker API] Use TLS encryption for communication with "on-the-fly" created key paris (non-exposed)

[Docker API] Create pipe to pass Rspamd UI worker password
[Dovecot] Pull Spamassassin ruleset to be read by Rspamd (MANY THANKS to Peer Heinlein!)
[Dovecot] Garbage collector for deleted maildirs (set keep time via MAILDIR_GC_TIME which defaults to 1440 minutes)
[Web] Flush memcached after mailbox item changes, fixes #1808
[Web] Fix duplicate IDs, fixes #1792
[Compose] Use SQL sockets
[PHP-FPM] Update APCu and Redis libs
[Dovecot] Encrypt maildir with global key pair in crypt-vol-1 (BACKUP!), also fixes #1791
[Web] Fix deletion of spam aliases
[Helper] Add "crypt" to backup script
[Helper] Override file for external SQL socket (not supported!)
[Compose] New images for Rspamd, PHP-FPM, SOGo, Dovecot, Docker API, Watchdog, ACME, Postfix

data/Dockerfiles/dovecot/maildir_gc.sh

@@ -0,0 +1,2 @@
+#/bin/bash
+[ -d /var/vmail/_garbage/ ] && /usr/bin/find /var/vmail/_garbage/ -mindepth 1 -maxdepth 1 -type d -cmin +${MAILDIR_GC_TIME} -exec rm -r {} \;