Merge pull request #4236 from ProjectMirador/netlify-node-version

Specify Node.js version for Netlify builds

Author: jcoyne

netlify.toml

@@ -4,6 +4,12 @@
 [build]
   publish = "dist/"
 
+[context.main.environment]
+  NODE_VERSION = "20.18.1"
+
+[context.deploy-preview.environment]
+  NODE_VERSION = "20.18.1"
+
 [[redirects]]
   from = "/"
   to = "/__tests__/integration/mirador/index.html"