* adding devcontainer and new rule for main-master
* update devcontainer work
* cleaning up devcontainer.json
* fixed line ending
* move to VARIANT 3
* Update .devcontainer/devcontainer.json
* Update .devcontainer/devcontainer.json
* Update .devcontainer/devcontainer.json
Co-authored-by: Pablo Aguiar <scorphus@gmail.com>