Blogdown and bookdown examples need contents write permission

[remlapmot]

I think that both the blogdown.yaml and bookdown.yaml examples require to write to contents because they are using the gh-pages branch.

[remlapmot]

I think the pr-commands.yaml, document.yaml, and render-rmarkdown.yaml were also missing contents write permissions. So I have added that to those and regenerated examples/README.md

[nanxstats]

Can confirm this issue for the (canonical) blogdown workflow. Without the write permission, the final "Deploy to GitHub Pages" step will have trouble writing to the gh-pages branch with the following error:

Force-pushing changes...
/usr/bin/git push --force ***github.com/<user>/<user>.github.io.git github-pages-deploy-action/b7eexlozc:gh-pages
remote: Permission to <user>/<user>.github.io.git denied to github-actions[bot].
fatal: unable to access 'https://github.com/<user>/<user>.github.io.git/': The requested URL returned error: 403
...
Error: The deploy step encountered an error: The process '/usr/bin/git' failed with exit code 128 ❌
Notice: Deployment failed! ❌

[gaborcsardi]

Thanks!

[github-actions]

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