Site CNAME removed on doc publish workflow

[hildjj]

After running the "Deploy to GitHub Pages" workflow, the site's custom domain is erased. I believe that the workflow needs to leave a file named CNAME in the root of the docs branch, containing the string "peggyjs.org" with no newline.

When I fix the issue in the website, that's the diff that github applies to the docs branch.

Assigned: @camchenry

[hildjj]

When fixing, please base the PR on the feature-docs branch, then I'll pull that into both stable and main.

[camchenry]

@hildjj We should be able to fix this by telling the 11ty compiler to copy the CNAME file to the output directory when compiling the website. It should be doable by just adding another line here:

https://github.com/peggyjs/peggy/blob/main/docs/.eleventy.js#L2-L7

Like so:

eleventyConfig.addPassthroughCopy("CNAME");

[hildjj]

On it.