ci: add Trivy scan to periodic workflow

.github/workflows/_trivy.yml

@@ -0,0 +1,35 @@
+name: Trivy vulnerability scan
+
+on:
+  workflow_call:
+
+jobs:
+  scan_container:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Build and export to Docker local cache
+        uses: docker/build-push-action@v7
+        env:
+          DOCKER_BUILD_RECORD_UPLOAD: false
+        with:
+          context: .
+          load: true
+          tags: tag_for_scanning
+
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@v0.36.0
+        with:
+          image-ref: 'tag_for_scanning'
+          version: 'v0.74.0'
+          format: 'table'
+          exit-code: '1'
+          ignore-unfixed: true
+          vuln-type: 'os,library'
+          severity: 'CRITICAL,HIGH'

.github/workflows/periodic.yml

@@ -11,3 +11,6 @@ jobs:
     uses: ./.github/workflows/_tox.yml
     with:
       tox: docs -- -b linkcheck
+
+  trivy:
+    uses: ./.github/workflows/_trivy.yml