feat: set bridge script based on ENV & add data-attribute (#8830)

Author: joshuaellis

packages/sanity/src/_internal/cli/server/renderDocument.tsx

@@ -125,9 +125,21 @@ export function decorateIndexWithAutoGeneratedWarning(template: string): string
  * with core-ui.
  */
 export function decorateIndexWithBridgeScript(template: string): string {
+  const sanityEnv = process.env.SANITY_INTERNAL_ENV || 'production'
+
+  /**
+   * The URL to the bridge script is determined by the
+   * `SANITY_INTERNAL_ENV` environment variable. So if you deploy
+   * a studio to the staging ENV then you'll get the correct script.
+   */
+  const scriptURL =
+    sanityEnv === 'production'
+      ? 'https://core.sanity-cdn.com/bridge.js'
+      : 'https://core.sanity-cdn.work/bridge.js'
+
   return template.replace(
     '</head>',
-    '<script src="https://core.sanity-cdn.com/bridge.js" async type="module"></script>\n</head>',
+    `<script src="${scriptURL}" async type="module" data-sanity-core></script>\n</head>`,
   )
 }