maybe add test?

.github/workflows/test.yml

@@ -0,0 +1,40 @@
+name: CI testing
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  serialization-test:
+    runs-on: ubuntu-latest
+
+    strategy:
+        matrix:
+            python-version: [ 3.10, 3.11, 3.12 ]
+
+    steps:
+      - name: Checkout main repository
+        uses: actions/checkout@v3
+
+      - name: Checkout test data
+        uses: actions/checkout@v3
+        with:
+          repository: icecube/skymap_scanner
+          ref: main
+          path: skymap_scanner
+          sparse-checkout: tests/data
+
+      - name: Set up Python
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install
+        run: |
+          pip install .
+
+      - name: Run Python script
+        # working-directory: auxiliary-repo/path/to/directory  # Replace 'path/to/directory' with the path to the directory containing your Python script
+        run: examples/npz_to_json.py --input-file skymap_scanner/tests/data/results_npz/millipede_wilks/run00136662.evt000035405932.neutrino_1.npz --output-dir .