refactor: keep one single CI

.github/workflows/python-app.yml

-# This workflow will install Python dependencies, run tests and lint with a single version of Python
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
-
-# https://github.com/ymyzk/tox-gh-actions
-
-name: CI Tests
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
-
-    services:
-      eralchemy-db:
-        image: postgres:alpine
-        env:
-          POSTGRES_DB: eralchemy
-          POSTGRES_PASSWORD: eralchemy
-          POSTGRES_PORT: 5432
-          POSTGRES_USER: eralchemy
-        ports:
-          - 5432:5432
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
-
-    steps:
-      - name: Clone this repository
-        uses: actions/checkout@v4
-
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-
-      - name: Set up pg-client and graphviz
-        run: |
-          sudo apt-get update
-          sudo apt-get -qq install graphviz python3-dev libgraphviz-dev pkg-config postgresql-client
-
-      - name: Setup database schema
-        run: psql -h localhost -U eralchemy -c 'CREATE SCHEMA eralchemy_test;'
-        env:
-          PGPASSWORD: eralchemy
-
-      - name: Install python test dependencies
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install tox tox-gh-actions
-
-      - name: Test with pytest and tox
-        run: tox