feat: Add GitHub Actions workflow for security scanning using govulncheck and Trivy.

Author: eywalker

.github/workflows/security.yml

@@ -0,0 +1,46 @@
+name: Security Scan
+
+on:
+  push:
+    branches: [ main, devenv-manager ]
+  pull_request:
+    branches: [ main, devenv-manager ]
+  schedule:
+    # Run weekly on Mondays at 9am UTC
+    - cron: '0 9 * * 1'
+
+jobs:
+  govulncheck:
+    name: Go Vulnerability Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24'
+      
+      - name: Run govulncheck
+        uses: golang/govulncheck-action@v1
+        with:
+          go-version-input: '1.24'
+          go-package: './...'
+  
+  trivy:
+    name: Trivy Security Scan
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@master
+        with:
+          scan-type: 'fs'
+          scan-ref: '.'
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+      
+      - name: Upload Trivy results to GitHub Security
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: 'trivy-results.sarif'