Add GitHub Actions workflow for PyPI publishing

Author: Amit123103

.github/workflows/publish.yml

@@ -0,0 +1,41 @@
+name: Publish StepDistanceCalculator to PyPI
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write  # Mandatory for PyPI Trusted Publishing (OIDC)
+      contents: read
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install Build Dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install build twine
+
+      - name: Build Package
+        run: |
+          python -m build
+
+      - name: Check Distribution
+        run: |
+          python -m twine check dist/*
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}
+          skip-existing: true