Better UX for Including Prereleases in PackageInstall versionSelection

[danielhelfand]

Describe the problem/challenge you have

For PackageInstall's referencing a prerelease package, a user must provide the following as part of a PackageInstall .spec.packageRef to successfully install the prerelease version:

versionSelection:
  constraints: 3.0.0-rc.1
  prereleases: {} # <----------

Prereleases must not be null as documented in #116. As of the current implementation in kapp-controller, the user is responsible for configuring this setting via the PackageInstall .spec.packageRef.versionSelection property.

For users specifying a specific version to install (like above), it might be a nice enhancement to just always consider prereleases as opposed to making users configure this prerelease behavior.

Describe the solution you'd like

To install a prerelease when a specific version is passed, I should not need to specify the prereleases: {} property above to install a prerelease version like below:

versionSelection:
  constraints: 3.0.0-rc.1

Anything else you would like to add:

We should consider if there are other cases should have prereleases considered by default.

We also have a test for the current behavior in place which can be adapted to TDD this feature out: https://github.com/vmware-tanzu/carvel-kapp-controller/blob/84fbfc9e426bfc9b4200319c38de29b0b7f82598/pkg/packageinstall/packageinstall_test.go#L19

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[github-actions[bot]]

This issue is being marked as stale due to a long period of inactivity and will be closed in 5 days if there is no response.

[aaronshurley]

@danielhelfand I noticed that the GH actions bot closed this out but I think it's still relevant?