added testpypi publishing pipeline

Author: sebastiantiesmeyer

.github/workflows/publish-testpypi.yml

@@ -0,0 +1,30 @@
+name: Publish Python Package to PyPI
+
+on:
+  push:
+    branches:
+      - pypi-test
+
+jobs:
+  test-publish:
+    runs-on: ubuntu-latest
+    environment: pypi-test
+    permissions:
+      id-token: write # to authenticate as Trusted Publisher to pypi.org
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+          cache: "pip"
+
+      - run: pip install build
+      - run: python -m build
+
+      - name: Publish to TestPyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
+