Automate version tag creation

.github/workflows/version_tag.yaml

@@ -0,0 +1,46 @@
+name: Create version tag
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'pyproject.toml'
+
+jobs:
+  create-version-tag:
+    name: Check version and create tag
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Extract version from pyproject.toml
+        id: get_version
+        run: |
+          VERSION=$(grep -m 1 '^version = ' pyproject.toml | sed 's/version = "\(.*\)"/\1/')
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "Extracted version: $VERSION"
+
+      - name: Check if tag exists
+        id: check_tag
+        run: |
+          if git rev-parse "${{ steps.get_version.outputs.version }}" >/dev/null 2>&1; then
+            echo "exists=true" >> $GITHUB_OUTPUT
+            echo "Tag '${{ steps.get_version.outputs.version }}' already exists"
+          else
+            echo "exists=false" >> $GITHUB_OUTPUT
+            echo "Tag '${{ steps.get_version.outputs.version }}' does not exist"
+          fi
+
+      - name: Create and push tag
+        if: steps.check_tag.outputs.exists == 'false'
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git tag -a "${{ steps.get_version.outputs.version }}"
+          git push origin "${{ steps.get_version.outputs.version }}"