Add GitHub Actions workflow for PyPI publishing

.github/workflows/publish.yaml

@@ -0,0 +1,13 @@
+name: Build and publish to PyPI
+on:
+  push:
+    tags:
+      - '*.*.*'
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: JRubics/poetry-publish@v2.0
+        with:
+          pypi_token: ${{ secrets.PYPI_TOKEN }}