Fix glide:data_url producing blank output during generation

src/Generator.php

@@ -128,6 +128,14 @@ public function bindGlide()
             new Flysystem(new LocalFilesystemAdapter($this->config['destination'].'/'.$directory))
         );
 
+        // Point the glide cache disk to the same location, so that anything
+        // reading generated images back (e.g. the glide:data_url tag) will
+        // find them where the server wrote them.
+        config([
+            'statamic.assets.image_manipulation.cache' => true,
+            'statamic.assets.image_manipulation.cache_path' => $this->config['destination'].'/'.$directory,
+        ]);
+
         $this->app->bind(UrlBuilder::class, function () use ($directory) {
             return new StaticUrlBuilder($this->app[ImageGenerator::class], [
                 'route' => URL::tidy($this->config['base_url'].'/'.$directory),

tests/GenerateGlideDataUrlTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Tests;
+
+use PHPUnit\Framework\Attributes\Test;
+use Tests\Concerns\RunsGeneratorCommand;
+
+class GenerateGlideDataUrlTest extends TestCase
+{
+    use RunsGeneratorCommand;
+
+    const ONE_PIXEL_PNG = 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==';
+
+    #[Test]
+    public function it_generates_data_urls_by_reading_images_from_the_static_glide_cache()
+    {
+        $this->files->put(public_path('image.png'), base64_decode(self::ONE_PIXEL_PNG));
+
+        $this->files->put(
+            base_path('resources/views/articles/show.antlers.html'),
+            '<img src="{{ glide:data_url src="/image.png" width="50" }}">'
+        );
+
+        $files = $this->generate();
+
+        $this->assertStringContainsString('src="data:image/png;base64,', $files['articles/one/index.html']);
+    }
+}