Add docker + vscode support

[seabbs]

This PR adds a docker container (with alll dependencies etc + vscode dev tools) based on a rocker image.

It also adds a github action to build this docker image and vscode config options to make spinning up a dev box easier (+ support for codespaces).

This would all make my life easier but might also be nice for others. Very optional though as obvious has no impact on the core code.

[codecov]

Codecov Report

Merging #177 (c1d5be7) into master (3f23387) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   54.56%   54.56%           
=======================================
  Files          19       19           
  Lines        1468     1468           
=======================================
  Hits          801      801           
  Misses        667      667           

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[nikosbosse]

looks good. So it builds a container whenever it pushes something and then you can just use that container for your dev work? And it will only have the master branch?

[seabbs]

Yes exactly on all of those.