Allow unprotected branches

[bzarboni1]

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ISSUE

#2 Create a repo where we can push to trunk/main

A situation arose, where a default branch with no branch-protection be created, when necessary.

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CHANGE

This change:

• Removes the default behaviour of adding the default_branch to the list of protected branches
• Setting the variable explicitly to an empty list (protected_branches = []) disables all branch protection
• Not setting this variable has the behaviour of setting the default_branch as a protected branch

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