add a workflow for tests

.github/workflows/run-tests.yaml

@@ -0,0 +1,23 @@
+name: Semgrep Tests
+on: [push]
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.11"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: false
+      - name: Install dependencies
+        run: poetry install --no-interaction --no-root
+      - name: Run tests
+        run: make test