postfix: fix rootfs file difference

Rootfs file differs with the same project configure, add preliminary
setting to avoid this.

Signed-off-by: Jinfeng Wang <jinfeng.wang.cn@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-networking/recipes-daemons/postfix/files/0006-postfix-add-preliminary-setting.patch

@@ -0,0 +1,31 @@
+From c09d377cd3b91c4c4360ebfab5be37f6296ff26a Mon Sep 17 00:00:00 2001
+From: Jinfeng Wang <jinfeng.wang.cn@windriver.com>
+Date: Wed, 16 Jul 2025 02:54:28 +0000
+Subject: [PATCH] postfix: add preliminary setting
+
+post-install call postconf commands to modify main.cf. When multiple
+parameters to postconf, the order of those parameters in main.cf is random.
+Then it will reproduce random results in rootfs file(sample-main.cf). To
+fix this, add preliminary setting in main.cf.
+
+Upstream-Status: Inappropriate [this is the use of post-install,
+upstream is not affected]
+
+Signed-off-by: Jinfeng Wang <jinfeng.wang.cn@windriver.com>
+---
+ conf/main.cf | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/conf/main.cf b/conf/main.cf
+index 2ee7996..0c208e6 100644
+--- a/conf/main.cf
++++ b/conf/main.cf
+@@ -683,3 +683,5 @@ sample_directory =
+ #
+ readme_directory =
+ inet_protocols = ipv4
++shlib_directory =
++meta_directory =
+-- 
+2.31.3
+

meta-networking/recipes-daemons/postfix/postfix_3.8.6.bb

@@ -26,6 +26,7 @@ SRC_URI = "http://ftp.porcupine.org/mirrors/postfix-release/official/postfix-${P
            file://0003-makedefs-Use-native-compiler-to-build-makedefs.test.patch \
            file://0004-Fix-icu-config.patch \
            file://0005-makedefs-add-lnsl-and-lresolv-to-SYSLIBS-by-default.patch \
+           file://0006-postfix-add-preliminary-setting.patch \
            "
 
 SRC_URI[sha256sum] = "4b6e17c826cc438cc3016a9c0a55ea7e77c6cbafba7dd57241d81b690b0e9774"