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Monitor test dependency images with renovate. Currently, only the core anchore images are monitored by renovate. Renovate needs to be updated to also monitor postgres in chart/values.yaml and redis/redis-exporter/bigbang/base in chart/deps/redis/values.yaml for new Iron Bank images. As Iron Bank approves new images, old ones are eventually purged. So, test images like the ones mentioned need to be updated regularly.