Add missing checkout step

Author: eel76-hmi

.github/workflows/devcontainer-command.yml

@@ -16,6 +16,9 @@ jobs:
       packages: write
 
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - uses: ./.github/actions/devcontainer
         with:
           token: ${{ secrets.GITHUB_TOKEN }}