fix(ci): Clone submodules.

Author: Et7f3

.github/workflows/build.yml

@@ -22,6 +22,9 @@ jobs:
           path: ~/.esy/source
           key: source-${{ hashFiles('**/index.json') }}
 
+      - name: Clone submodules
+        run: git submodule update --init
+
       - name: Install
         run: esy install