add github actions

Author: vuolen

.github/workflows/pull_request.yml

@@ -0,0 +1,18 @@
+name: Pulumi
+on:
+  - pull_request
+jobs:
+  preview:
+    name: Pulumi Preview
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.13
+
+      - run: pip install -r requirements.txt
+      - uses: pulumi/actions@v6
+        with:
+          command: preview
+          cloud-url: ${{ secrets.PULUMI_CLOUD_URL }}