Add Dockerfile.alpine for alpine buil; add tini to debian image

[brtwrst]

This PR adds a separate Dockerfile.alpine to build an image based on Alpine Linux.
The resulting image will be just over 100M in size.
The build and resulting image works on AMD64 (Tested on Ubuntu 20.04) and ARM64 (Tested on a RPI3 with Ubuntu 22.04)

During testing i switched between the yarn start and node app.js start commands and when using the latter, the container will exit with code 143 (which i think is the correct code) as opposed to exit code 1 when using yarn start.
So i included the node app.js command for now.

[brtwrst]

Based upon the discussion in #14 i have added tini to both dockerfiles.

[brtwrst]

I have tested both dockerfiles locally. Final sizes are 235M for the debian based image and 102M for the alpine one.
You can tell docker to use the alpine image either with a docker-compose.yml file or by buiding the image with

docker build -f Dockerfile.alpine .

[hasanhakkaev]

LGTM! Thanks!

[jlongster]

Awesome, thanks for coming to solution!

[jlongster]

Oh shoot there's a conflict.

@brtwrst mind fixing?

[brtwrst]

Yes this happened because #14 was merged. Which changes the Dockerfile to build the alpine based image (and does not work on ARM64.) . I am confused now.

What should i provide now?

• A Dockerfile that builds the alpine image and a Dockerfile.bullseye that builds the debian image?
• Or a Dockerfile that builds the debian image and a Dockerfile.alpine that builds the alpine image?

[brtwrst]

I have recreated the originally proposed configuration.

• A Dockerfile that builds the debian image and a Dockerfile.alpine that builds the alpine image

[hasanhakkaev]

The idea looks good to me. There is a go to image which is debian based , and for those who want alpine based there is one too. Thank you @brtwrst for the effort.

[jlongster]

Thanks for the work @brtwrst! I ended up reverting the other PR and then reverting that revert because I didn't see you had based your changed on it. That let me merge your changes in.

Can you double-check on that docker files look correct?

[brtwrst]

They are correct, thanks for your time