Change CI to always deploy via workflow trigger

[JobDoesburg]

Right now we deploy on the following moments:

• automatically on push to master, to staging env
• via workflow_dispatch on master, to production env
• via responding deploy on a PR, to develop

I propose to do the following:

• automatically on push to master, to staging env
• via workflow_dispatch on any branch, to any env

This way, we can have multiple branches active and allow them all to be deployed to master if we want it. I think that for the purpose of this project, where we sometimes might want to make changes to thadmin for a specific event, this is desirable. Github offers a nice UI for this, too (when triggering a workflow, you can specify the branch you want to use, and you can select multiple env's to deploy to)

[JobDoesburg]

[JobDoesburg]