Docker File: 

FROM node:lts-alpine
ENV NODE_ENV=production
WORKDIR /usr/src/app
COPY ["package.json", "package-lock.json*", "npm-shrinkwrap.json*","sshd_config","entrypoint.sh", "./"]
RUN npm install --production --silent && mv node_modules ../
COPY sshd_config /etc/ssh/
 
 
# Start and enable SSH
RUN apk add openssh \
       && echo "root:Docker!" | chpasswd \
                     && chmod +x //usr/src/app/entrypoint.sh \
                     && cd /etc/ssh/ \
                     && ssh-keygen -A
COPY . .
EXPOSE 3000 2222
#RUN chown -R node /usr/src/app
#USER node
ENTRYPOINT [ "/usr/src/app/entrypoint.sh" ] 

 
sshd_config:
 
Port                                    2222
ListenAddress                  0.0.0.0
LoginGraceTime                             180
X11Forwarding                yes
Ciphers aes128-cbc,3des-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr
MACs hmac-sha1,hmac-sha1-96
StrictModes                     yes
SyslogFacility                    DAEMON
PasswordAuthentication             yes
PermitEmptyPasswords               no
PermitRootLogin             yes
Subsystem sftp internal-sftp
 
entrypoint.sh

#!/bin/sh
set -e
 
# Get env vars in the Dockerfile to show up in the SSH session
eval $(printenv | sed -n "s/^\([^=]\+\)=\(.*\)$/export \1=\2/p" | sed 's/"/\\\"/g' | sed '/=/s//="/' | sed 's/$/"/' >> /etc/profile)
 
echo "Starting SSH ..."
/usr/sbin/sshd
exec npm start