Merge postfix configurations and use conditionals

.env.sample

@@ -151,6 +151,7 @@ DB_FLAVOR=sqlite
 # Mailman settings
 ###################################
 # COMPOSE_FILE="compose.yml:compose.mailman.yml"
+# MAILMAN_POSTFIX_OVERRIDES=1
 # MAILMAN_CORE_VOLUME=lists_example_com_mailman-core
 # MAILMAN_CORE_NETWORK=lists_example_com_internal
 
@@ -161,3 +162,4 @@ DB_FLAVOR=sqlite
 # there is an open ticket with a further discussion also https://github.com/Mailu/Mailu/issues/1096
 ###################################
 # COMPOSE_FILE="compose.yml:compose.mailfrom.yml"
+# SENDER_LOGINS_POSTFIX_OVERRIDES=1

compose.senderlogins.yml

@@ -3,15 +3,10 @@ version: "3.6"
 services:
   smtp:
     configs:
-      - source: mailfrom_overrides
-        target: /overrides/postfix.cf
       - source: sender_logins
         target: /overrides/sender_logins
 
 configs:
-  mailfrom_overrides:
-    name: ${STACK_NAME}_mailfrom_overrides_${POSTFIX_OVERRIDE_VERSION}
-    file: postfix.mailfrom.cf
   sender_logins:
     name: ${STACK_NAME}_sender_logins_${SENDER_LOGIN_VERSIONS}
     file: sender_logins

postfix.cf

@@ -2,6 +2,7 @@
 # https://mailu.io/1.7/faq.html?highlight=override#how-can-i-override-settings
 # https://github.com/Mailu/Mailu/blob/master/core/postfix/conf/main.cf
 
+{{ if eq (env "MAILMAN_POSTFIX_OVERRIDES") "1" }}
 # Please note, this config assumes "recipient_delimiter = +" in the main.cf
 # and transport_maps/relay_domains preserve the overriden postfix.cf config values
 # and finally, we use single lines configuration definitions because:
@@ -12,3 +13,10 @@ owner_request_special = no
 transport_maps = regexp:/opt/mailman/var/data/postfix_lmtp \${podop}transport
 local_recipient_maps = regexp:/opt/mailman/var/data/postfix_lmtp
 relay_domains = regexp:/opt/mailman/var/data/postfix_domains \${podop}transport
+{{ end }}
+
+{{ if eq (env "SENDER_LOGINS_POSTFIX_OVERRIDES") "1" }}
+# https://github.com/Mailu/Mailu/issues/1096
+
+smtpd_sender_login_maps = unionmap:{${podop}senderlogin, pcre:/overrides/sender_logins}
+{{ end }}

postfix.mailfrom.cf

@@ -1,3 +0,0 @@
-# https://github.com/Mailu/Mailu/issues/1096
-
-smtpd_sender_login_maps = unionmap:{${podop}senderlogin, pcre:/overrides/sender_logins}