wip: patch pod definition for build jobs on Pythia's JS2 BinderHub #6498
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Merging this PR will trigger the following deployment actions. Support deploymentsNo support upgrades will be triggered Staging deploymentsNo staging hub upgrades will be triggered Production deployments
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agoose77
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See #6499 for context.
This PR implements a mechanism to patch the pod definition for repo2docker builds so that we can inject an
ephemeral-storagerequest. This is intended to represent an estimate of the per-build cache usage, which would allow k8s to schedule builds on new nodes once the build cache is overpopulated.It is assumed that the kubelet is successfully tracking the actual available space, so that at some time$t$ the scheduler can identify the case $\text{CurrentEphem}(t) + \text{RequestedEphem}(t) > \text{TotalEphem}$ , and trigger a scale-up