Add GitHub workflows

.github/workflows/create_release_from_tag.yml

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+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+    - 'v*'
+
+name: Create release and attach sdist
+
+jobs:
+  build:
+    name: Build sdist and create release draft
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install build
+      - name: Build sdist
+        run: |
+          python -m build --sdist
+      - name: Get version from tag
+        id: get_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF#refs/tags/v}
+      - name: Check package version (compare package version with tag)
+        id: check_package_version
+        shell: python
+        run: |
+          from packaging.version import parse
+          from setuptools.config import read_configuration
+          package_version = read_configuration('setup.cfg')['metadata']['version']
+          if parse(package_version) != parse('${{ steps.get_version.outputs.VERSION }}'):
+            print(f'version mismatch: {package_version} (package) vs ${{ steps.get_version.outputs.VERSION }} (tag)')
+            exit(1)
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          draft: true
+          prerelease: false
+      - name: Upload Release Asset
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps
+          asset_path: ./dist/django-questionnaire-core-${{ steps.get_version.outputs.VERSION }}.tar.gz
+          asset_name: django-questionnaire-core-${{ steps.get_version.outputs.VERSION }}.tar.gz
+          asset_content_type: application/tar+gzip

.github/workflows/publish_release_on_pypi.yml

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+on:
+  release:
+    types: [published]
+
+name: Upload release to PyPI
+jobs:
+  generate:
+    name: Create release-artifacts
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Install build dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install build
+      - name: Build sdist & wheel
+        run: |
+          python -m build --sdist --wheel
+      - name: Publish a Python distribution to PyPI
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}
+          # password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          # repository_url: https://test.pypi.org/legacy/