Add GitHub Action to run test script

.github/workflows/test.yml

@@ -0,0 +1,27 @@
+name: Test
+
+on: push
+
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout main branch
+        uses: actions/checkout@v4
+
+      - name: Checkout gh-pages branch
+        uses: actions/checkout@v4
+        with:
+          ref: "gh-pages"
+          path: "data"
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: "pip"
+
+      - name: Test
+        run: |
+          python3 test.py data/