feat(dev): add devcontainer config to test and dev on sogo

.devcontainer/conf/postfix/Dockerfile

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+# original catatnight/postfix
+FROM agiledigital/postfix:latest
+
+ADD main.cf /etc/postfix/main.cf
+ADD mailname /etc/mailname
+ADD virtual /etc/postfix/virtual
+ADD entrypoint.sh /entrypoint.sh
+

.devcontainer/conf/postfix/entrypoint.sh

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+#!/bin/bash
+
+cp /etc/postfix/main.cf /etc/postfix/main.cf.bak
+chown root:root /etc/postfix/virtual
+chown root:root /etc/postfix/virtual.db
+postmap /etc/postfix/virtual
+
+/opt/install.sh
+# /opt/install.sh make changes /etc/postfix/main.cf, so restore bak file
+rm -f /etc/postfix/main.cf
+cp /etc/postfix/main.cf.bak /etc/postfix/main.cf
+/usr/bin/supervisord -c /etc/supervisor/supervisord.conf

.devcontainer/conf/postfix/mailname

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+example.org

.devcontainer/conf/postfix/main.cf

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+# Debian specific:  Specifying a file name will cause the first
+# line of that file to be used as the name.  The Debian default
+# is /etc/mailname.
+#myorigin = /etc/mailname
+
+smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
+biff = no
+
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+
+readme_directory = no
+
+# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 3.6 on
+# fresh installs.
+compatibility_level = 3.6
+
+# TLS parameters
+smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
+smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
+smtpd_tls_security_level=may
+
+smtp_tls_CApath=/etc/ssl/certs
+smtp_tls_security_level=may
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+
+smtp_sender_dependent_authentication = yes
+smtp_sasl_auth_enable = yes
+smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
+
+smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
+myhostname = localhost
+alias_maps = hash:/etc/aliases
+alias_database = hash:/etc/aliases
+mydestination = example.org
+mydomain = example.org
+relayhost = 
+mailbox_size_limit = 51200000
+recipient_delimiter = 
+inet_interfaces = all
+inet_protocols = all
+maillog_file = /var/log/mail.log
+myorigin = /etc/mailname
+default_transport = error
+relay_transport = error
+
+mailbox_transport = lmtp:inet:imapd:24
+
+local_recipient_maps = hash:/etc/postfix/virtual

.devcontainer/conf/postfix/virtual

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+@example.org root