add publish workflow

.github/workflows/publish.yml

@@ -0,0 +1,33 @@
+name: Publish to PyPI
+on:
+  push:
+    paths: ["src/xpp/__init__.py", "pyproject.toml"]
+
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/xpp
+    permissions:
+      id-token: write
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.12"
+        cache: "pip"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e . hatch
+    - name: Build package
+      run: hatch build
+    - name: Publish to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1