Hugo 0.123.0 broke local development for us (but there's a fix!)

Our local dev environment stopped working when we upgraded from Hugo 0.122.0 to 0.123.4. After upgrading, running hugo server now resulted with:

Error: error copying static files: mkdir /var/www: permission denied
Task "Hugo Preview" exited with a non-zero exit status: 1.

That path /var/www is the publishDir for the remote server. It’s not typically accessible locally. Commenting out publishDir in config.yml allowed us to work around the problem. I assumed this was just a regression that would be fixed soon, but then I found the list of known breaking changes in 0.123.0, specifically this one:

Adding --renderToMemory to hugo server has fixed us up.

Just wanted to publicly note this specific error we saw and how to fix it. It took a bit of digging for us to figure out, so I thought it might be helpful to others.

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