**DRAFT** ci: Trivy workflow

.github/workflows/trivy_security.yml

@@ -0,0 +1,51 @@
+name: Trivy security scan
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  schedule:
+    - cron: '0 9 * * *'
+
+# only allow one instance of this workflow to be running per PR or branch, cancels any that are already running
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  trivy_scan:
+    name: Trivy Scan
+    permissions:
+        contents: read # for actions/checkout to fetch code
+        security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        with:
+          disable-sudo: true
+          egress-policy: audit
+
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          fetch-depth: 0
+
+      - name: Run Trivy in report mode
+        uses: aquasecurity/trivy-action@915b19bbe73b92a6cf82a1bc12b087c9a19a5fe2 # v.0.28.0
+        with:
+          version: 'v0.57.1' # maybe a temporary workaround for the ghcr throttling issue https://github.com/aquasecurity/trivy-action/issues/389#issuecomment-2484110603
+          scan-type: 'fs'
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+          ignore-unfixed: true
+          skip-dirs: 'tests' # because we use lots of vulnerable test dependencies
+          severity: 'CRITICAL,HIGH'
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@662472033e021d55d94146f66f6058822b0b39fd # v3.27.0
+        with:
+          sarif_file: 'trivy-results.sarif'