add some github actions

[CMon]

1. update latest docker to the current state of development (or create a new tag ala: devel) so we can use the recent version if possible, currently latest is even older than 0.9.0
2. if tagged create and upload a new version to docker hub
3. add a build and test workflow

[ezavgorodniy]

Current changes in master branch contains some breaking changes and before producing new version @cschneider4711 need to do some testing to ensure that breaking changes are mititgated

It's a good point about having GitHub action to make a release, not sure how it's implemented at the moment, but I reckon it's a manual process of pushing docker image to docker hub. And I'd absolutely vote that for Threagile 1.0 this needs to be done through CI/CD