Dockerized SSH box

First start:

copy example-env to .env
Edit the file:
- modify your user ID number as USR
- EXPOSE to port exposed outside
start with docker-compose
data/ and home/ folders appear
create user by adding authorized_keys contents to data/users/[UID]-[username] file
- example: vim users/2000-user1 <- copy id_rsa.pub contents there