GitHub Action: Generate a build and push to another branch

publish.yml

# .github/workflows/publish.yml
name: Generate a build and push to another branch

on:
  push:
    branches:
      - master # Remove this line if your primary branch is "main"
      - main # Remove this line if your primary branch is "master"

jobs:
  build:
    runs-on: ubuntu-latest
    name: Build and Push
    steps:
      - name: git-checkout
        uses: actions/checkout@v2

      - name: Install all dependencies
        run: npm install

      - name: Build
        run: npm run build # The build command of your project
    
      - name: Push
        uses: s0/git-publish-subdir-action@develop
        env:
          REPO: self
          BRANCH: build # The branch name where you want to push the assets
          FOLDER: build # The directory where your assets are generated
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # GitHub will automatically add this - you don't need to bother getting a token
          MESSAGE: "Build: ({sha}) {msg}" # The commit message

I'm getting this error:

remote: Write access to repository not granted.
fatal: unable to access 'https://github.com/<repo>.git/': The requested URL returned error: 403

Error: Process exited with code: 128:
remote: Write access to repository not granted.
fatal: unable to access 'https://github.com/<repo>.git/': The requested URL returned error: 403

    at ChildProcess.<anonymous> (/home/runner/work/_actions/s0/git-publish-subdir-action/develop/action/dist/index.js:11966:20)
    at ChildProcess.emit (node:events:513:[28](https://github.com/<repo>/actions/runs/7593337563/job/20683765413#step:5:29))
    at maybeClose (node:internal/child_process:1100:16)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:[30](https://github.com/<repo>/actions/runs/7593337563/job/20683765413#step:5:31)4:5)

<repo> is my repository's path ("org/repo").

@ThatBlockyPenguin https://stackoverflow.com/questions/70538793/remote-write-access-to-repository-not-granted-fatal-unable-to-access