update pypi autocommit to extract version number from release tag

Former-commit-id: 0f8b6bc

Author: PolarBean

Diff for: .github/workflows/python-publish.yml

@@ -26,6 +26,12 @@ jobs:
       uses: actions/setup-python@v3
       with:
         python-version: '3.x'
+    - name: Extract tag name
+      id: tag
+      run: echo ::set-output name=TAG_NAME::$(echo $GITHUB_REF | cut -d / -f 3)
+    - name: Update version in setup.py
+      run: >-
+        sed -i "s/{{VERSION_PLACEHOLDER}}/${{ steps.tag.outputs.TAG_NAME }}/g" setup.py
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip