Skip trivy DB update for SBOM job
As we only generate the sbom with trivy we don't need to update the DB
it would avoid failure due to rate limitation:
2024-10-02T07:40:09Z FATAL Fatal error rootfs scan error: scan error: scan failed: failed analysis: post analysis error: post analysis error: Unable to initialize the Java DB: Java DB update failed: DB download error: oci download error: failed to fetch the layer: GET https://ghcr.io/v2/aquasecurity/trivy-java-db/blobs/sha256:54bf40698d24f75a9368553bad38f5b981ff3cb4bdced7f8f5fb120166d60ecb: TOOMANYREQUESTS: retry-after: 770.151µs, allowed: 44000/minute
Edited by Loic Nicolle