Tests: Setup automatic tests with github workflow for this project.

[amarts]

So that we are absolutely sure while merging that the code changes are not causing a regression

[Gmin2]

We need to add a github actions to trigger when saomeone create a pr for this repo right

[amarts]

We need to add a github actions to trigger when saomeone create a pr for this repo right

Yes. There is already a check for yarn build (ie, the build is successful) but need is to add more tests (like running demo scripts etc).