Resource not accessible by integration about merge-branch HOT 2 OPEN

I've passed through this issue too and I've made a huge search by a solution.

This log is not even a bit intuitive. But, by the status code response (403), I've guessed that it could be something related to authorization. And it is!

Taking a look on the source code, I've found that it ocurrors when we make a action that our GITHUB_TOKEN is not supposed to do.

Solution:
Include this lines on your workflow:

permissions:
      contents: write

It can be at the job scope or at workflow at all.

This behavior can be setted to the whole repositry too. Go to:
Settings -> Actions -> General -> Workflow permissions -> Read and write permissions

source: https://docs.github.com/en/actions/security-guides/automatic-token-authentication

PS: github.token is a context copy of GITHUB_TOKEN. So, if you don't understand from where cames this variable, that is the answer.

from merge-branch.

I'm also seeing the same issue. I've tried a changing a few permissions on the job to no avail.

from merge-branch.