Add AIO Dockerfile

docker/opendkim/opendkim.conf

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+# OpenDKIM configuration for happyDeliver
+# Verifies DKIM signatures on incoming emails
+
+# Log to syslog
+Syslog yes
+SyslogSuccess yes
+LogWhy yes
+
+# Run as this user and group
+UserID opendkim:mail
+
+UMask 002
+
+# Socket for Postfix communication
+Socket unix:/var/spool/postfix/opendkim/opendkim.sock
+
+# Process ID file
+PidFile /var/run/opendkim/opendkim.pid
+
+# Operating mode - verify only (not signing)
+Mode v
+
+# Canonicalization methods
+Canonicalization relaxed/simple
+
+# DNS timeout
+DNSTimeout 5
+
+# Add header for verification results
+AlwaysAddARHeader yes
+
+# Accept unsigned mail
+On-NoSignature accept
+
+# Always add Authentication-Results header
+AlwaysAddARHeader yes
+
+# Maximum verification attempts
+MaximumSignaturesToVerify 3