feat(Vercel) dont generate md exports on preview builds

Author: sergical

package.json

@@ -17,6 +17,7 @@
     "dev:developer-docs": "yarn enforce-redirects && NEXT_PUBLIC_DEVELOPER_DOCS=1 yarn dev",
     "build:developer-docs": "yarn enforce-redirects && git submodule init && git submodule update && NEXT_PUBLIC_DEVELOPER_DOCS=1 yarn build",
     "build": "yarn enforce-redirects && next build && yarn generate-md-exports",
+    "build:preview": "yarn enforce-redirects && next build",
     "generate-md-exports": "node scripts/generate-md-exports.mjs",
     "vercel:build:developer-docs": "yarn enforce-redirects && git submodule init && git submodule update && NEXT_PUBLIC_DEVELOPER_DOCS=1 yarn build",
     "start:dev": "NODE_ENV=development yarn build && yarn start",

vercel.json

@@ -1,4 +1,6 @@
 {
+  "$schema": "https://openapi.vercel.sh/vercel.json",
+  "buildCommand": "sh vercel.sh",
   "headers": [
     {
       "source": "/(.*)",

vercel.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+ 
+if [[ $VERCEL_ENV == "production"  ]] ; then
+  yarn run build
+else
+  yarn run build:preview
+fi