chore: Add comments to `start-mailserver.sh` and stop using `inherit_errexit` (#4161)

CHANGELOG.md

@@ -47,6 +47,7 @@ All notable changes to this project will be documented in this file. The format
 - **Internal:**
   - The main `mail.log` which is piped to stdout via `tail` now correctly begins from the first log line of the active container run. Previously some daemon logs and potential warnings/errors were omitted. ([#4146](https://github.com/docker-mailserver/docker-mailserver/pull/4146))
   - Fixed a regression introduced in v14 where `postfix-main.cf` appended `stderr` output into `/etc/postfix/main.cf`, causing Postfix startup to fail ([#4147](https://github.com/docker-mailserver/docker-mailserver/pull/4147))
+  - Unused `shopt -s inherit_errexit` removed from `start-mailserver.sh` ([#4161](https://github.com/docker-mailserver/docker-mailserver/pull/4161))
 
 ### CI
 

target/scripts/start-mailserver.sh

@@ -1,7 +1,11 @@
 #!/bin/bash
 
+# When 'pipefail' is enabled, the exit status of the pipeline reflects the exit status of the last command that fails.
+# Without 'pipefail', the exit status of a pipeline is determined by the exit status of the last command in the pipeline.
 set -o pipefail
-shopt -s globstar inherit_errexit
+
+# Allows the usage of '**' in patterns, e.g. ls **/*
+shopt -s globstar
 
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