[Bug] Nextjs plugin not detected when using sites:create-template

[taty2010]

Used the sites:create-template to clone & deploy the next-toolbox template, Netlify did not detect that I was using Nextjs and never installed the plugin which ended up producing a 404 error.

I initially thought it might be related to the git clone error we've been experiencing here but you will still run into the same issue whether you try to clone it or not. I also tested it out with the Gatsby template and the Gatsby plugin was installed successfully.

[tinfoil-knight]

The @netlify/plugin-nextjs plugin isn't getting installed for production builds (through ntl deploy --build) as reported but the plugin is getting installed by Netlify Build when the development environment runs (through ntl dev)

[serhalp]

Closed by #6729