update-trivy-cache.yml

# https://github.com/aquasecurity/trivy-action?tab=readme-ov-file#updating-caches-in-the-default-branch
# This workflow is needed to get around rate limiting on ghcr. This will update the trivy DBs in the
# github cache to allow the trivy scans themselves to run without pulling the DB.  This will allow the
# scans to run without running into rate limit issues.  This workflow could run into those issues when
# downloading the cache, but as long as it succeeds more often than it fails, we will have our bases
# covered.
name: Update Trivy DB Caches

on:
  workflow_dispatch:
  schedule:
    - cron: '17 2 * * *' # Daily at random time (2:17am UTC)

jobs:
  update-caches:
    runs-on: ubuntu-latest
    steps:
      - name: Setup oras
        uses: oras-project/setup-oras@v1

      - name: Get current date
        id: date
        run: echo "date=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT

      - name: Download and extract the vulnerability DB
        run: |
          mkdir -p $GITHUB_WORKSPACE/.cache/trivy/db
          oras pull ghcr.io/aquasecurity/trivy-db:2
          tar -xzf db.tar.gz -C $GITHUB_WORKSPACE/.cache/trivy/db
          rm db.tar.gz

      - name: Download and extract the Java DB
        run: |
          mkdir -p $GITHUB_WORKSPACE/.cache/trivy/java-db
          oras pull ghcr.io/aquasecurity/trivy-java-db:1
          tar -xzf javadb.tar.gz -C $GITHUB_WORKSPACE/.cache/trivy/java-db
          rm javadb.tar.gz

      - name: Cache DBs
        uses: actions/cache/save@v4
        with:
          path: ${{ github.workspace }}/.cache/trivy
          key: cache-trivy-${{ steps.date.outputs.date }}