chore(ci): Initialize GitHub workflows

.github/workflows/ci.yml

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+name: CI
+
+on: [push, pull_request]
+
+jobs:
+
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        python-version:
+        - "3.11"
+        - "3.12"
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: "pip"
+        cache-dependency-path: |
+          setup.cfg
+    - name: Install dependencies
+      run: |
+        python -m pip install -U pip setuptools
+        python -m pip install -U -e '.[test]'
+    - name: Test with pytest
+      timeout-minutes: 30
+      run: |
+        python -m pytest -v --cov=src tests
+    - name: Send code coverage report
+      uses: codecov/codecov-action@v3
+      with:
+        env_vars: GHA_OS,GHA_PYTHON
+
+  required-checks:
+    if: always()
+    needs: [test]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Decide whether the needed jobs succeeded or failed
+      uses: re-actors/alls-green@release/v1
+      with:
+        jobs: ${{ toJSON(needs) }}
+
+  deploy-to-pypi:
+    needs: [test]
+    if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
+    runs-on: ubuntu-latest
+    environment: deploy-to-pypi-qedis
+    permissions:
+      id-token: write
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.11"
+        cache: "pip"
+        cache-dependency-path: |
+          setup.cfg
+    - name: Install dependencies
+      run: |
+        python -m pip install -U pip setuptools
+        pip install -U -e '.[build]'
+    - name: Build sdist and wheel
+      run: |
+        python -m build -s -w
+    - name: Publish
+      uses: pypa/gh-action-pypi-publish@release/v1

.github/workflows/timeline-check.yml

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+name: timeline-check
+
+on: [pull_request]
+
+jobs:
+  towncrier:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.11"
+        cache: "pip"
+        cache-dependency-path: |
+          requirements/timeline-check.txt
+    - name: Install dependencies
+      run: |
+        python -m pip install -U pip setuptools wheel
+        pip install -U -r requirements/timeline-check.txt
+    - name: Check existence of news fragment
+      run: |
+        git fetch --no-tags origin +refs/heads/${BASE_BRANCH}:refs/remotes/origin/${BASE_BRANCH}
+        python -m towncrier.check --compare-with=origin/${BASE_BRANCH}
+      env:
+        BASE_BRANCH: ${{ github.base_ref }}

requirements/timeline-check.txt

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+towncrier~=22.12

tests/conftest.py

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+# TODO: write tests