init_container.sh

#!/usr/bin/env bash
cat >/etc/motd <<EOL 
  _____                               
  /  _  \ __________ _________   ____  
 /  /_\  \\___   /  |  \_  __ \_/ __ \ 
/    |    \/    /|  |  /|  | \/\  ___/ 
\____|__  /_____ \____/ |__|    \___  >
        \/      \/                  \/ 
A P P   S E R V I C E   O N   L I N U X
Documentation: http://aka.ms/webapp-linux
Ruby quickstart: https://aka.ms/ruby-qs
Ruby version $RUBY_VERSION
Note: Any data outside '/home' is not persisted
EOL
cat /etc/motd

# Get environment variables to show up in SSH session
eval $(printenv | sed -n "s/^\([^=]\+\)=\(.*\)$/export \1=\2/p" | sed 's/"/\\\"/g' | sed '/=/s//="/' | sed 's/$/"/' >> /etc/profile)

sed -i "s/SSH_PORT/$SSH_PORT/g" /etc/ssh/sshd_config
service ssh start

# Get environment variables to show up in SSH session
eval $(printenv | awk -F= '{print "export " $1"="$2 }' >> /etc/profile)

/opt/startup.sh "$@"