fix: add element's test flow

Author: MilagrosMarin

.github/workflows/test.yaml

@@ -0,0 +1,30 @@
+name: Test
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        py_ver: ["3.9", "3.10"]
+        mysql_ver: ["8.0"]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{matrix.py_ver}}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{matrix.py_ver}}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8 "black[jupyter]"
+      - name: Run style tests
+        run: |
+          python_version=${{matrix.py_ver}}
+          black element_lab --check --verbose --target-version py${python_version//.}