docker image is run by default as root (privileged) user

[Constantin07]

At the moment docker image runs as root user when invoked.
I would suggest to use a non-privileged user in image by default.

[wata727]

You are right. But I'm a little concerned about the incompatibility of changing the default user...

[Constantin07]

@wata727 here is PR with the change #69 ready for review please.
Technically, inside container it runs as non-privileged user the same way.
Do you have an example of some incompatibility ?
PS: it does make sense to add in feature at least some test scenarios in CI so that we can capture broken tests for build container.

[wata727]

For example, the following code from Super-Linter will no longer work.
https://github.com/github/super-linter/blob/05f34c653f433dfac36856d446a0d624c46c2012/Dockerfile#L124

Originally, this image was not intended to be used as-is (probably too many things are missing), so a non-root user may not be necessary.