feat: implement remote repository support for manifest updates

- Added functionality to push updated manifests to a remote Git repository after building.
- Introduced a Git token configuration in the builder settings to authenticate pushes.
- Enhanced the CLI to handle remote repository synchronization, including cloning and pulling updates.
- Updated the builder to return detailed results on whether updates occurred during the build process.
- Revised documentation to reflect new configuration options and usage instructions.

Signed-off-by: Innei <tukon479@gmail.com>

env.ts

@@ -18,6 +18,9 @@ export const env = createEnv({
     S3_EXCLUDE_REGEX: z.string().optional(),
 
     PG_CONNECTION_STRING: z.string().min(1).optional(),
+
+    // Git token for uploading updated manifest to remote repository
+    GIT_TOKEN: z.string().optional(),
   },
   runtimeEnv: process.env,
   isServer: typeof window === 'undefined',