(CDPE-7069) Start caching trivy DBs in separate workflow

.github/workflows/update-trivy-cache.yml

@@ -0,0 +1,43 @@
+# 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 }}