ci: add gh python tests workflow

.github/workflows/test.yaml

@@ -0,0 +1,24 @@
+name: "Test: Python"
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+      - develop
+  pull_request:
+
+jobs:
+
+  test:
+    name: "test backend"
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - run: pip install -r backend/requirements.txt
+      - run: pytest backend/tests