Add CI workflow configuration and update README for CI badge

Author: marc-lehner

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "**"
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pixi
+        uses: prefix-dev/setup-pixi@v0.8.2
+        with:
+          cache: true
+
+      - name: Install environment
+        run: pixi install
+
+      - name: Run tests
+        run: pixi run pytest

README.md

@@ -1,5 +1,7 @@
 # ![Image](https://www.knime.com/sites/default/files/knime_logo_github_40x40_4layers.png) KNIME® -  KNIME PYTHON EXTENSION TEMPLATE
 
+[![CI](https://github.com/marc-lehner/knime_rdkit_python_demo/actions/workflows/ci.yml/badge.svg)](https://github.com/marc-lehner/knime_rdkit_python_demo/actions/workflows/ci.yml)
+
 This repository is maintained by the [KNIME Team Rakete](mailto:team-rakete@knime.com).
 
 It provides a template for creating KNIME Python extensions.