Add InstanceSnapshot status validation

[air-31]

This PR adds a kubebuilder validation marker for InstanceSnapshot CRD

[kingmakerbot]

Hi @air-31. Thanks for your PR.

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Make sure this PR appears in the CrownLabs changelog, adding one of the following labels:

• kind/breaking: 💥 Breaking Change
• kind/feature: 🚀 New Feature
• kind/bug: 🐛 Bug Fix
• kind/cleanup: 🧹 Code Refactoring
• kind/docs: 📝 Documentation

[QcFe]

Thanks @air-31!
Just to be sure, I'd also add the empty string to the allowed values, as it is for instances.

[kingmakerbot]

The generated files in the operators/ folder appear to be out-of-date.

Please, ensure you are using the correct version of controller-gen and re-run:

make generate
make manifests

Here it is an excerpt of the diff:

diff --git a/operators/deploy/crds/crownlabs.polito.it_instancesnapshots.yaml b/operators/deploy/crds/crownlabs.polito.it_instancesnapshots.yaml%0Aindex b6e5cd8..9911de9 100644%0A--- a/operators/deploy/crds/crownlabs.polito.it_instancesnapshots.yaml%0A+++ b/operators/deploy/crds/crownlabs.polito.it_instancesnapshots.yaml%0A@@ -99,6 +99,7 @@ spec:%0A               phase:%0A                 description: Phase represents the current state of the Instance Snapshot.%0A                 enum:%0A+                - ""%0A                 - Pending%0A                 - Processing%0A                 - Completed

[air-31]

@QcFe done! A week later, though...

[QcFe]

/merge