[SSL] create individual domain certificates, add SNI configs for Postfix/Dovecot/Nginx

data/Dockerfiles/postfix/postfix.sh

@@ -19,6 +19,20 @@ spam: "|/usr/local/bin/rspamd-pipe-spam"
 EOF
 newaliases;
 
+# create sni configuration
+echo -n "" > /opt/postfix/conf/sni.map;
+for cert_dir in /etc/ssl/mail/*/ ; do
+  if [[ ! -f ${cert_dir}domains ]] || [[ ! -f ${cert_dir}cert.pem ]] || [[ ! -f ${cert_dir}key.pem ]]; then
+    continue;
+  fi
+  IFS=" " read -r -a domains <<< "$(cat "${cert_dir}domains")"
+  for domain in "${domains[@]}"; do
+    echo -n "${domain} ${cert_dir}key.pem ${cert_dir}cert.pem" >> /opt/postfix/conf/sni.map;
+    echo "" >> /opt/postfix/conf/sni.map;
+  done
+done
+postmap -F hash:/opt/postfix/conf/sni.map;
+
 cat <<EOF > /opt/postfix/conf/sql/mysql_relay_recipient_maps.cf
 # Autogenerated by mailcow
 user = ${DBUSER}