Update python-publish.yml with auto version from tag

Author: lionel42

.github/workflows/python-publish.yml

@@ -30,6 +30,12 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install build
+    - name: Extract tag name
+      id: tag
+      run: echo ::set-output name=TAG_NAME::$(echo $GITHUB_REF | cut -d / -f 3)
+    - name: Update version in pyproject.toml
+      run: >-
+        sed -i "s/{{VERSION_PLACEHOLDER}}/${{ steps.tag.outputs.TAG_NAME }}/g" pyproject.toml
     - name: Build package
       run: python -m build
     - name: Publish package