setup/dkim: chown created dkim directories and keys to config user (#3783)

Co-authored-by: Brennan Kinney <5098581+polarathene@users.noreply.github.com>

CHANGELOG.md

@@ -38,6 +38,8 @@ All notable changes to this project will be documented in this file. The format
 
 ### Fixes
 
+- **Setup:**
+  - `setup` CLI - `setup dkim domain` now creates the keys files with the user owning the key directory ([#3783](https://github.com/docker-mailserver/docker-mailserver/pull/3783))
 - **Dovecot:**
   - During container startup for Dovecot Sieve, `.sievec` source files compiled to `.svbin` now have their `mtime` adjusted post setup to ensure it is always older than the associated `.svbin` file. This avoids superfluous error logs for sieve scripts that don't actually need to be compiled again ([#3779](https://github.com/docker-mailserver/docker-mailserver/pull/3779))
 - **Internal:**

target/bin/open-dkim

@@ -144,6 +144,9 @@ while read -r DKIM_DOMAIN; do
       --directory="/tmp/docker-mailserver/opendkim/keys/${DKIM_DOMAIN}"
   fi
 
+  # fix permissions to use the same user:group as /tmp/docker-mailserver/opendkim/keys
+  chown -R "$(stat -c '%U:%G' /tmp/docker-mailserver/opendkim/keys)" "/tmp/docker-mailserver/opendkim/keys/${DKIM_DOMAIN}"
+
   # write to KeyTable if necessary
   KEYTABLEENTRY="${SELECTOR}._domainkey.${DKIM_DOMAIN} ${DKIM_DOMAIN}:${SELECTOR}:/etc/opendkim/keys/${DKIM_DOMAIN}/${SELECTOR}.private"
   if [[ ! -f "/tmp/docker-mailserver/opendkim/KeyTable" ]]; then