Optimize pipeline workflow

[Fuglen]

As a(n) TFB Developer
I want to to make sure that the pipeline runs successfully everytime
So that I'm free from debugging pipeline and deploy multiple times to the live server.

Detailed description:
We need to test the pre-deployment steps. Make sure that the pipeline can actually download plugins and start a server without errors.
It should not push/deploy anything if the pipeline fails, because then it might not have deployed everything.
Apparently you can push to a branch after your PR have been accepted and it will use your newly pushed commits in the pipeline. The last one Im not sure how to prevent, but we could simply delete the branch after pipeline have ran.

• Make branch push tests
• Prevent branch from being reused
• Prevent deployment if any errors arrise