add trivy scanning (#15)

Signed-off-by: David van der Spek <[email protected]>

.github/workflows/trivy-scan.yml

@@ -0,0 +1,39 @@
+name: trivy
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+    - main
+  push:
+    branches:
+    - main
+  schedule:
+  - cron: "0 0 * * *"
+jobs:
+  trivy-scan:
+    name: Trivy IaC scan
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read # for actions/checkout to fetch code
+      security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
+      actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Run Trivy vulnerability scanner in IaC mode
+        uses: aquasecurity/trivy-action@master
+        with:
+          scan-type: 'fs'
+          hide-progress: false
+          scan-ref: '.'
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+          scanners: 'vuln,secret,config'
+          ignore-unfixed: true
+          #severity: 'CRITICAL,HIGH'
+      - name: Upload Trivy scan results to GitHub Security tab
+        continue-on-error: true # TODO: remove once https://github.com/aquasecurity/tfsec/issues/1955 is resolved
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: 'trivy-results.sarif'