`helm dependency build` only downloads charts from repositories that are already registered in the local repository
cache. On a fresh runner that cache is empty, so the classic repository of the valkey dependency could not be resolved:
"no repository definition for https://valkey.io/valkey-helm. Please add the missing repos via 'helm repo add'". The two
bitnami dependencies were unaffected, because OCI references do not need a repository entry.
`helm dependency update` resolves the repository URLs straight from `Chart.yaml` and therefore needs no additional
`helm repo add` step. Repeating the URL in the workflow would only invite drift, since renovate updates `Chart.yaml`
alone. All three dependencies are pinned to exact versions, so the resolution result is identical to `Chart.lock`.
This corrects 0102563, which introduced the `dependency build` step.
Co-authored-by: Copilot <copilot@github.com>