Add workflow to run tests on pull request or push to main

.github/workflows/run-tests.yml

@@ -0,0 +1,21 @@
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+      - name: Install dependencies
+        run: |
+          pip install -U requests beautifulsoup4
+      - name: Run tests
+        run: |
+          code/tests.py