CI/CD workflow

[pcaversaccio]

We must setup a proper CI/CD workflow. The repository should be setup in the future in such a way that changes to the branch release-staging and release-production will trigger a rebuild of the Staging and the Production application, respectively.

The merge flow for changes should be as follows:

<feature-branch> -> <develop> -> <main> -> <release-staging> -> <release-production>

[pcaversaccio]

Part of this issue is resolved by PR #22