[stable/chartmuseum] fixed name of service account

[ChrisCooney1]

What this PR does / why we need it:

There is a bug in the chart museum helm chart. There is a value Values.serviceAccount.name that allows you to specify the name of your service account. This is important because the name of the service account needs to be known for IRSA role mapping. However, the helm chart always defaults to {{ include "chartmuseum.fullname" . }}.

This PR solves this with the usual conditional logic for these values.

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Title of the PR starts with chart name (e.g. [stable/mychartname])

[k8s-ci-robot]

Hi @ChrisCooney1. Thanks for your PR.

I'm waiting for a helm member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[yurrriq]

/lgtm
thanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChrisCooney1, yurrriq

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[yurrriq]

/ok-to-test