[Concourse] Vault Auth Param should be treated as a secret

[chrishiestand]

Is this a request for help?:
No

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Is this a BUG REPORT or FEATURE REQUEST? (choose one):
Bug Report

In the recently merged large PR #7804, the vault auth param was moved from a pair of secrets (Values.secrets.vaultAppRoleId,Values.secrets.vaultAppRoleSecretId) into a chart value (concourse.web.vault.authParam) that doesn't have a corresponding entry in secrets.yaml.

But since CONCOURSE_VAULT_AUTH_PARAM is supposed to be used to pass secret credentials, the helm chart should treat them as secret credentials - and allow keeping them out of helm/tiller.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Any further update will cause the issue/pull request to no longer be considered stale. Thank you for your contributions.

[chrishiestand]

Just waiting on merge.