Update Supabase version and improve Keystatic's configurations

This commit updates the version of Supabase in multiple packages. It also introduces specificity to environment variables in Keystatic configuration and adds a method to create a 'KeyStatic' reader based on the storage kind. Furthermore, minor adjustments have been made to keep the environment variable names consistent.

packages/cms/keystatic/src/create-reader.ts

@@ -0,0 +1,41 @@
+import { z } from 'zod';
+
+/**
+ * Create a KeyStatic reader based on the storage kind.
+ */
+export async function createKeystaticReader() {
+  switch (process.env.KEYSTATIC_STORAGE_KIND ?? 'local') {
+    case 'local': {
+      const { default: config } = await import('./keystatic.config');
+      const { createReader } = await import('@keystatic/core/reader');
+
+      return createReader('.', config);
+    }
+
+    case 'github':
+    case 'cloud': {
+      const { default: config } = await import('./keystatic.config');
+
+      const githubConfig = z
+        .object({
+          token: z.string(),
+          repo: z.custom<`${string}/${string}`>(),
+          pathPrefix: z.string().optional(),
+        })
+        .parse({
+          token: process.env.KEYSTATIC_GITHUB_TOKEN,
+          repo: process.env.KEYSTATIC_STORAGE_REPO,
+          pathPrefix: process.env.KEYSTATIC_PATH_PREFIX,
+        });
+
+      const { createGitHubReader } = await import(
+        '@keystatic/core/reader/github'
+      );
+
+      return createGitHubReader(config, githubConfig);
+    }
+
+    default:
+      throw new Error(`Unknown storage kind`);
+  }
+}