Build failure after adding custom nginxServerConfig

I made a patch today to fix preview for our react.js app: eclipsefdn/it/websites/membership.eclipse.org!630 (diffs)

The main thing that I need is on line 11 of the config/nginx-preview/default.conf file.

However, the builds fails after I added it to our Jenkinsfile.www: eclipsefdn/it/websites/membership.eclipse.org!630 (diffs)

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