Update install_flux.sh to use kustomize that comes with kubectl.

Merge Request

Script Changes

Instead of having to install kustomize (which sucks), let's use the version bundled with kubectl.

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assigned to @jasonkrause

requested review from @micah.nagel, @BrandenCobb, and @ryan.j.garcia

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Seems to work with kubectl 1.21.0 (what the pipeline uses). I don't know if this is risky given that mine failed on kubectl 1.20.4 or if we just make a big release note? kubectl 1.20.x end of life is Feb 28 so we're not far off...

@ryan.j.garcia @BrandenCobb

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So sounds like...

• add a check to validate kubectl version is 1.21+, use kubectl kustomize if so
• if kubectl < 1.21, use kustomize as before (probably don't need a version check since we didn't have one before)
• (maybe?) add a check for kustomize binary and use it if exists (maybe with a version check too)

@michaelmcleroy not that we can 100% trust this but kustomize states in their repo that kubectl kustomize will be kept up to date going forward - https://github.com/kubernetes-sigs/kustomize#kubectl-integration - maybe that gives more confidence in using it.

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• d46a70ce - Adding version check

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• d46a70ce...c70ab51f - 186 commits from branch master
• 1b88f0e6 - Merge branch 'master' into jasonkrause-master-patch-19737

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mentioned in commit 2417d6b8