feat: [SEC-7263] Add dependency-scan GitHub Actions workflow

Generate Node.js SBOM using launchdarkly/gh-actions for SEC-7263.
Add policy evaluation step with bom-* artifacts pattern.
Configure triggers for pull requests and main branch pushes.

Co-Authored-By: Patrick Kaeding <[email protected]>

Author: devin-ai-integration[bot]

.github/workflows/dependency-scan.yml

@@ -0,0 +1,30 @@
+name: Dependency Scan
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  generate-nodejs-sbom:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Generate SBOM
+        uses: launchdarkly/gh-actions/actions/dependency-scan/generate-sbom@main
+        with:
+          types: 'nodejs'
+
+  evaluate-policy:
+    runs-on: ubuntu-latest
+    needs:
+      - generate-nodejs-sbom
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Evaluate SBOM Policy
+        uses: launchdarkly/gh-actions/actions/dependency-scan/evaluate-policy@main
+        with:
+          artifacts-pattern: bom-*