CI: Do not fetch whole repository where not needed

In the run_on_droplet job we only require the .github/scripts dir

Author: olethanh

.github/workflows/build-deb-package-and-integration-tests.yml

@@ -150,9 +150,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          submodules: true
 
       - name: Install doctl
         uses: digitalocean/action-doctl@v2