add dockerfile, update readme

[realies]

could be used to fix #1138 if the image is published in a container image repository

[superpoussin22]

running as root is a bad idea
check this : Dockerfile

[realies]

running as root is a bad idea check this : Dockerfile

what's bad about it?
ps: why do you install the extra dependencies?

[superpoussin22]

as best practice it recommended to start process in a container as standard user and not as root

[Hummenix]

@realies

what's bad about it?

Quite simply the same reason you shouldn't run any process as root if not absolutely necessary. It is possible to break out of a docker container (look up "docker privilege escalation/breakout" for more info), or it could be misconfigured and misbehave leading to issues with the host system.
Yes, docker is pretty well isolated, but the risk is still there, and there is no benefit from running as root. It's just a secure practice.

[realies]

I've reduced the privileges in the latest commit.
@superpoussin22, wondering why your Dockerfile installs more dependencies.

[matiboux]

As a best practice, RUN install instructions in a Dockerfile should not leave cache behind. This helps to minimize the layers & image size. I suggested changes to clear apt's cache and disable pip3's cache.

[realies]

Thanks, @matiboux. I've applied your suggestions in the latest commit.

[whitehara]

I also made docker related files and send PR as #1418
Shoud I merge this PR?

[realies]

I also made docker related files and send PR as #1418
Shoud I merge this PR?

Dunno man, all other Dockerfiles I've seen so far look more complex without any (obvious to me) reason.

[whitehara]

I also made docker related files and send PR as #1418
Shoud I merge this PR?

Dunno man, all other Dockerfiles I've seen so far look more complex without any (obvious to me) reason.

OK. Your Dockerfile is almost the same as mine. But my PR has other feature about environment variables.
So I think it depends on which is preferred by the repo owner to merge.

[mashb1t]

#1418 is now more mature than this PR, please consider contributing your ideas there.