Add Trivy nightly scan (#83)

---------

Co-authored-by: Maciej Golaszewski <[email protected]>

.github/workflows/trivy.yaml

@@ -0,0 +1,61 @@
+name: Trivy
+
+on:
+  schedule:
+    - cron: '0 10 * * *'
+
+jobs:
+  list-branches-to-scan:
+    runs-on: ubuntu-latest
+    outputs:
+      branches: ${{ steps.branches.outputs.branches }}
+    steps:
+      - name: Checking out repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: List branches to scan
+        id: branches
+        run: |
+          # regex matches branches like
+          #  origin/1.28
+          #  origin/v1.1
+          #  origin/release-1.30
+          #  origin/main
+          BRANCHES=$(git branch -r | grep  -E '^  origin\/(((v|release-)?[0-9]+.[0-9]+)|main)$' | \
+            sed -e 's#^  origin/##'  | jq -R -s -c 'split("\n")[:-1]')
+          echo "branches=$(echo $BRANCHES)" >> $GITHUB_OUTPUT
+  scan:
+    runs-on: ubuntu-latest
+    needs: list-branches-to-scan
+    strategy:
+      matrix:
+        branch: ${{ fromJson(needs.list-branches-to-scan.outputs.branches) }}
+    permissions:
+      security-events: write
+    steps:
+      - name: Checking out repo
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ matrix.branch }}
+          fetch-depth: 0
+      - name: Run Trivy vulnerability scanner in repo mode
+        uses: aquasecurity/[email protected]
+        with:
+          scan-type: "fs"
+          ignore-unfixed: true
+          format: "sarif"
+          output: "output.sarif"
+          severity: "MEDIUM,HIGH,CRITICAL"
+        env:
+          TRIVY_DB_REPOSITORY: "public.ecr.aws/aquasecurity/trivy-db"
+      - name: Get commit sha
+        run: |
+          SHA="$(git rev-parse HEAD)"
+          echo "head_sha=$SHA" >> "$GITHUB_ENV"
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: "output.sarif"
+          sha: ${{ env.head_sha }}
+          ref: refs/heads/${{ matrix.branch }}