feat: add sample Git submodule (#4)

* feat: add project-starter as a Git submodule

Signed-off-by: Alfi Maulana <alfi.maulana.f@gmail.com>

* ci: add step to assert git submodules in test workflow

Signed-off-by: Alfi Maulana <alfi.maulana.f@gmail.com>

---------

Signed-off-by: Alfi Maulana <alfi.maulana.f@gmail.com>

Author: threeal

.github/workflows/test.yaml

@@ -11,3 +11,15 @@ jobs:
     steps:
       - name: Checkout Project
         uses: actions/checkout@v4.2.0
+        with:
+          submodules: recursive
+
+      - name: Assert Git Submodules
+        run: |
+          ACTUAL=$(git submodule status --recursive)
+          EXPECTED=" bea29a84b6c55a49fef34be3e7a17498c633b6d9 project-starter (v1.2.0)"
+          if [ "$ACTUAL" != "$EXPECTED" ]; then
+            echo "actual: $ACTUAL"
+            echo "expected: $EXPECTED"
+            exit 1
+          fi

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "project-starter"]
+	path = project-starter
+	url = https://github.com/threeal/project-starter.git