Add workflow for automated publishing

.github/workflows/pypi_publish.yml

@@ -0,0 +1,23 @@
+name: Publish to PyPI
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+        - 'main'
+    paths:
+        - 'pyproject.toml'
+
+jobs:
+  publish:
+    name: upload release to PyPI
+    runs-on: ubuntu-latest
+    permissions:
+      # IMPORTANT: this permission is mandatory for trusted publishing
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pdm-project/setup-pdm@v4
+
+      - name: Publish package distributions to PyPI
+        run: pdm publish