Update CI workflow to fetch submodules during checkout

.github/workflows/ci.yml

@@ -2,29 +2,24 @@ name: CI
 
 # Controls when the workflow will run
 on:
-  # Triggers the workflow on push or pull request events but only for the "main" branch
   push:
     branches: ['main']
   pull_request:
     branches: ['main']
-
-  # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  # This workflow contains a single job called "build"
   build:
-    # The type of runner that the job will run on
     runs-on: self-hosted
 
-    # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v4
+      - name: Checkout repository with submodules
+        uses: actions/checkout@v4
         with:
-          submodules: true
-          fetch-depth: 0
+          submodules: true # Recursively clone submodules
+          token: ${{ secrets.GITHUB_TOKEN }} # Use built-in GITHUB_TOKEN for private submodules
+          fetch-depth: 0 # Fetch full history to avoid issues with shallow clones
 
       # Pull the latest version of base images and rebuild without cache
       - name: Build and deploy