Add initial GitHub Actions workflow for Plumber

Author: mcafaro

.github/workflows/plumber.yml

@@ -0,0 +1,19 @@
+name: Plumber
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  plumber:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v6
+      - uses: getplumber/plumber@346a5299d477dc0a0e360521df7818c212bbe578
+        with:
+          score-push: false