fix: Kaniko builder resource limit

[mojtaba-esk]

An issue reported by @rach-id on kaniko build. After investigation, it turned out that it hit the ephemeral storage limit and it seems to be working with 10Gi when building Celestia-app repo.

This PR suggests a fix to resolve that issue.
More context can be found in this chat.

Note: I could not run it on the current version of Robusta as the pod keeps pending for ever to get the resources; tested it on local minikube.

[mojtaba-esk]

Merging this PR must wait until we fix the resource provision for it and then it passes the TestBuildFromGit test.

[rach-id]

Ideally, we should have a mechanism that deletes old images if the storage is full. Or even delete all the images. I think all the images would be good for nothing once the tests are over

[smuu]

Ideally, we should have a mechanism that deletes old images if the storage is full. Or even delete all the images. I think all the images would be good for nothing once the tests are over

This is not about images that are not used anymore. We use ephemeral storage, which only exists while the Pod runs. As Kaniko uses more than we thought, our Kubernetes nodes were unprepared for that. We increased that limit, which should fix it.

By the way, Kubernetes has a garbage collector that deletes unused images if the disk runs full.