Add PyPI release workflow and rename CI file

Add a new GitHub Actions workflow (python-package.yml) to build and publish packages to PyPI. The workflow triggers on tag pushes (v*.*.*) and on PR events, sets up Python, caches pip, installs build tooling (build, twine, packaging), builds the package, and uploads artifacts to PyPI using TWINE_API_KEY. Also rename .github/workflows/ci.yml to .github/workflows/testing-ci.yml to clarify CI purpose.

Author: C-Achard

.github/workflows/python-package.yml

@@ -0,0 +1,59 @@
+name: Update pypi release
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+  pull_request:
+    branches:
+      - main
+      - public
+    types:
+      - labeled
+      - opened
+      - edited
+      - synchronize
+      - reopened
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Setup Python
+        id: setup-python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Cache dependencies
+        id: pip-cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('pyproject.toml', 'requirements.txt', 'setup.cfg', 'setup.py') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-${{ steps.setup-python.outputs.python-version }}-
+            ${{ runner.os }}-pip-
+
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install wheel
+          pip install "packaging>=24.2"
+          pip install build
+          pip install twine
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Build and publish to PyPI
+        if: ${{ github.event_name == 'push' }}
+        env:
+          TWINE_USERNAME: __token__
+          TWINE_PASSWORD: ${{ secrets.TWINE_API_KEY }}
+        run: |
+          python -m build
+          ls dist/
+          tar tvf dist/deeplabcut_live-*.tar.gz
+          python3 -m twine upload --verbose dist/*