Create OHDSI-wide Github Actions

[schuemie]

Currently, each HADES package has a copy of the workflow for checking and releasing packages. That means that a change must be applied separately to each HADES repo.

It would be preferable if we had central Github Actions that all repos could reference instead. I tried creating such actions, in the newly creates OHDSI actions repo, but didn't succeed. My main issues were

• I'm not familiar with the syntax requirements for actions.
• I wasn't able to use GitHub secrets in the actions. Maybe this just isn't possible.

If anyone wants to pick this up, it would be a great help.