chore(security): add weekly + PR malware scan workflow

Author: stackmasteraliza

.github/workflows/malware-scan.yml

@@ -0,0 +1,18 @@
+name: malware-scan
+
+on:
+  pull_request:
+  schedule:
+    - cron: "16 4 * * 1"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  scan:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      - name: Scan for injected malware
+        run: node scripts/scan-malware.cjs