deployment: incorrect SYMBOLS_CACHE_SIZE_MB setting when using resourceFieldRef

[caugustus-sourcegraph]

The SYMBOLS_CACHE_SIZE_MB setting in the symbols deployment is incorrectly auto-calculated from an ephemeral storage resource size. The variable expects MB but the requests are provided in bytes.

Adding a divisor will resolve this issue:

            resourceFieldRef:
              containerName: symbols
              resource: requests.ephemeral-storage
              divisor: "1M"

[github-actions]

Heads up @davejrt @ggilmore @dan-mckean @caugustus-sourcegraph @StephanX - the "team/delivery" label was applied to this issue.