Add optional persistent volume for cacheDir

[cykl]

My understanding is that renovatebot can leverage some cache to speed up execution and make fewer requests to external service but helm charts has no support for a persistent volume that would allow to persist this cache across execution.

I should be able to create the PV outside of the chart and then using extraVolume(Mount)?s, but this kind of workflow is always clunky. It would be great being able to declare a persistent volume as something like as follow and have it automatically mounted.

  persistentVolume:
    enabled: true
    accessModes:
      - ReadWriteOnce
    size: xxGi
    storageClass: "xxx"

Perhaps baseDir / cacheDir could be automatically set, but it seems perfectly acceptable having to make such configuration.

[viceice]

Most effective will be this paths: renovate/cache/renovate/repository/**/*.json

[benedikt-bartscher]

this could also be useful for renovates persistRepoData option

[kvanzuijlen]

Most effective will be this paths: renovate/cache/renovate/repository/**/*.json

Could you tell me the absolute path?

Edit: found it; /tmp/renovate/cache