closes: Work with a developer to refine the default docker file for node

[spchortis]

Node dockerfile:

• Use caching layers in case the same runner or local builds it
• Rename workspace to avoid multiple src under the same path

[zaremba-tomasz]

It would be nice to add a USER directive to avoid using root.

[spchortis]

It would be nice to add a USER directive to avoid using root.

I had tried initially but since there is no shell in it would need few steps to create a non root user. Didn't do since these are dev related images.
After some digging I found that nonroot may exist in the image although it is not nonroot tagged image. I can try out.