fix(docker) images: make dockerfiles use node:lts-buster-slim as base image

[timoknapp]

@coderaiser : It seems that the regular Node docker images cannot be executed on arm architecture anymore. This leads to weird errors while starting the containers.

After some further analysis I found that the issue can be resolved by using a different base docker image (buster-slim) of Node.

For more info read here

I therefore updated the two Dockerfiles to match fix this issue.

This fix will also resolve #357

• commit message named according to Contributing Guide
• npm run codestyle is OK
• npm test is OK

[coderaiser]

As I see buster is Debian image. Can we use alpine for alpine image?

[timoknapp]

As I see buster is Debian image. Can we use alpine for alpine image?

Yes I tried to use an alpine image for Dockerfile.alpine but with those alpine images I get the same errors as before. I could not find another solution until now.

So either we:

• get rid of the -alpine Docker releases
• stick with the releases for now and let both images be based on the buster images.

I try my best to find a working solution for the alpine releases today. In case I fail, we can still decide on how to continue. What do you think?

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[coderaiser]

I think we can apply fix for debian based image, and try to get working alpine image or other as small as alpine, maybe previous version of node.js will work?

[timoknapp]

@coderaiser I just found another issue in the pipeline. I will create a new PR soon to fix it.