mtaBuild failed - ERROR could not create the "Makefile_20250202212143.mta"" file: open Makefile_20250202212143.mta: permission denied

[miyasuta]

I have configured my workflow as follows (no configuration file other than this has been provided) :

name: CI

on:
  push:
    branches:
      - main

permissions:
  contents: write

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
    - name: Checkout code
      uses: actions/checkout@v4

    - name: Build
      uses: SAP/project-piper-action@main
      with:
        step-name: mtaBuild

The workflow failed with the following error:

error mtaBuild - [2025-02-02 21:21:43] ERROR could not create the "Makefile_20250202212143.mta"" file: open Makefile_20250202212143.mta: permission denied

It seems that the error is caused by missing privileges, but I haven't found a way to resolve it.
The code is available here: https://github.com/miyasuta/github-action-piper
Any input would be appreciated!