Allow .raw.css files to be imported in the integration (#798)

* Text loader for .raw.css files

* changeset

* update changeset

Author: taranvohra

.changeset/fuzzy-steaks-end.md

@@ -0,0 +1,5 @@
+---
+'@gitbook/cli': minor
+---
+
+Allow .raw.css files to be imported in the integration

packages/cli/src/build.ts

@@ -57,6 +57,9 @@ export async function buildScriptFromManifest(
             // If importing a file as `.raw.js`, esbuild will convert to string so we can use that
             // file as a string without opening it.
             '.raw.js': 'text',
+            // If importing a file as `.raw.css`, esbuild will convert to string so we can use that
+            // file as a string without opening it.
+            '.raw.css': 'text',
         },
     });