Add alternative docker container based on alpine

[DuratarskeyK]

Add an alternative Dockerfile based on alpine, that builds faster than ubuntu one, weights less and adds support for proxy.php left/right support as it is on the site itself.

[DuratarskeyK]

Uh, sorry, I left your original Dockerfile and added my own called Dockerfile.alpine.

[DuratarskeyK]

I added a second build-run command for my own Dockerfile.

[DuratarskeyK]

docker build --tag=jdd:v1-alpine --file=Dockerfile . Should be docker build --tag=jdd:v1-alpine --file=Dockerfile.alpine . If you want me to make an ubuntu/alpine dockerfile I can try, though I don't have experience in that(but I'll figure it out, I guess).

[zgrossbart]

The dockerfile you made is great. Thank you very much for the contribution. I don't think we need another one.