Enable or check 'Read and Write' under Settings > Actions > General > Workflow Permissions.
If the regular GITHUB_TOKEN doesn't work, use a PAT (most likely would have to switch to it when integrating with data.table anyway) with appropriate permissions.
By default, GAs at present don't seem to have write permissions (required to push a comment in PRs for my case):
Solutions:
GITHUB_TOKEN
doesn't work, use a PAT (most likely would have to switch to it when integrating withdata.table
anyway) with appropriate permissions.