ci: Add write permission to release action so it can create the branch (#57)

Author: Christopher-Chianelli

.github/workflows/release.yml

@@ -30,6 +30,8 @@ jobs:
       name: pypi
       url: https://pypi.org/p/timefold-solver
     permissions:
+      contents: write  # IMPORTANT: required for action to create release branch
+      pull-requests: write # IMPORTANT: so release PR can be created
       id-token: write  # IMPORTANT: mandatory for trusted publishing
     steps:
       - name: Print inputs to the release workflow