How to manage Python releases and upload them to Test.PyPi or PyPi? To take control of the major releases, I use a '.env' file.

pre-release.yml

name: Publish Pre-Release

on:
  push:
    # When a new tag is created for an alpha or beta version, this workflow starts running
    tags:
      - 'v*alpha*'
      - 'v*beta*'
jobs:
  build:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest
    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v2
      - name: Set up Python
        uses: actions/setup-python@v2
      # Gets the release version from the tag
      - name: Get the version
        id: get_version
        run: echo ::set-output name=VERSION::$(echo $GITHUB_REF | cut -d / -f 3)
      # Installs build using pip  
      - name: Install pypa/build
        run: python -m pip install build
      # Builds the package assigning the result og the get_version step to an environment variable called VERSION
      - name: Build a binary wheel and a source tarball
        run: python -m build
        env:
          VERSION: ${{ steps.get_version.outputs.VERSION }}
      # Publish the package in Test PyPi using your token stored in GitHub Secrets
      - name: Publish distribution 📦 to Test PyPI
        uses: pypa/gh-action-pypi-publish@master
        with:
          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
          repository_url: https://test.pypi.org/legacy/
      # Creates the pre-release in GitHub
      - name: Create Release
        id: create_release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
        with:
          tag_name: ${{ github.ref }}
          release_name: PyOpenProject ${{ github.ref }}
          body_path: CHANGELOG.md
          draft: false
          prerelease: true
      # If something goes wrong, deletes the tag created in GitHub
      - name: Delete tag
        run: git push --delete origin ${{ github.ref }}
        if: ${{ failure() }}

release.yml

name: Publish Release

on:
  workflow_run:
    workflows: [ "Run Test Cases" ]
    branches: [ main ]
    types:
      - completed
jobs:
  build:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest
    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v2
      - name: Set up Python
        uses: actions/setup-python@v2
      # Gets the version of the release from the .env file, setting the result as a step output
      - name: Get Version
        id: get_version
        run: echo "##[set-output name=version;]$(source ./.env && export VERSION && echo $VERSION)"
      # Installs build using pip  
      - name: Install pypa/build
        run: python -m pip install build
      # Builds the package assigning the result og the get_version step to an environment variable called VERSION
      - name: Build a binary wheel and a source tarball
        run: python -m build
        env:
          VERSION: ${{ steps.get_version.outputs.version }}
      # Publish the package in PyPi using your token stored in GitHub Secrets
      - name: Publish distribution 📦 to PyPI
        uses: pypa/gh-action-pypi-publish@master
        with:
          password: ${{ secrets.PYPI_API_TOKEN }}
      # Creates the major release in GitHub
      - name: Create Release
        id: create_release
        uses: actions/create-release@v1
        env:
          VERSION: ${{ steps.get_version.outputs.version }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
        with:
          tag_name: ${{ steps.get_version.outputs.version }}
          release_name: PyOpenProject ${{ steps.get_version.outputs.version }}
          body_path: CHANGELOG.md
          draft: false
          prerelease: false
      # If something goes wrong, deletes the tag created in GitHub
      - name: Delete tag
        run: |
          git push --delete origin "${{ steps.get_version.outputs.version }}"
        if: ${{ failure() }}