add devcontainer and modify interactive install scripts

[chheis]

I added a devcontainer configuration to setup a fast and easy environment.
But, with reusing the setup scripts the interactive input is still mandatory.
So did not work out yet.
Maybe in a collaborative cooperation we can fix it. Or use only the devcontainer setup?

[vtz]

@chheis would you mind rebasing your PR so that I can approve it? What are the errors you're having with interactive mode? I can help to fix it.

[chheis]

@chheis would you mind rebasing your PR so that I can approve it? What are the errors you're having with interactive mode? I can help to fix it.

@vtz Merged the newest changes from your main branch.

The issue with the interactive mode is that I wanted to use your dev tools installation script, instead of putting them all in the dev container script. (Avoid double work)
But while I am enhancing your scripts with a parameter for CI they where not working as I expected.
Directly with post init scripts it was working fine, setting up the tool environment in the dev container, working with Codespaces is working as well (what i normally prefer)

So I think it would be up to you, to decide which way you like to go:

1. CI first with dev container (easy to setup the build workflows) also with prebuild/released devcontainer images
2. Workstation build first (with interactive scripts)