fix: workaround for nightly versions in checkConfig()

[AstroProfundis]

What problem does this PR solve?

If a cluster is deployed with the real version of nightly of that day, e.g.: v5.0.0-nightly-20210405 instead of nightly, and when there is a new nightly version overwrites that value (and as we don't keep old nightly versions, the v5.0.0-nightly-20210405 then no longer available in the repo), a reload operation will fail with unknown version error.

If the cluster was deployed with nightly as version, all seems working correctly.

What is changed and how it works?

Check if the cluster version is a nightly version, and use nightly as version to query binary paths in repo for the component.

This may, in theory, encounter issues when the deployed nightly version was so far behind the real latest nightly version, the the entry point path of component has changed since it was deployed and last upgraded.

Note that this should be considered as a workaround only, and we may need to refactor the checkConfig() for better nightly version handling.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Side effects

• Increased code complexity

Related changes

• Need to cherry-pick to the release branch

Release notes:

cluster: workaround for config checks of manually deployed nightly versions

[lucklove]

/lgtm

[ti-chi-bot]

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[lucklove]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: a7492ef