Add PyPI publish workflow, unit testing workflow

.github/workflows/publish_to_pypi.yml

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+name: Upload new PaDELPy version to PyPI
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.11'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install build
+    - name: Build package
+      run: python -m build
+    - name: Publish package to PyPI
+      uses: pypa/gh-action-pypi-publish@27b31702a0e7fc50959f5ad993c78deac1bdfc29
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}

.github/workflows/run_tests.yml

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+name: Run ECabc tests
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v3
+        with:
+          python-version: '3.11'
+      - name: Install dependencies
+        run: |
+            python -m pip install --upgrade pip
+            pip install build
+            pip install pytest pytest-md
+      - name: Install package
+        run: python -m pip install .
+      - name: Run tests
+        uses: pavelzw/pytest-action@v2
+        with:
+          emoji: false
+          report-title: 'ECabc test report'