Revisit and stabilize flags used for remote caching/execution

[buchgr]

No description provided.

[buchgr]

@agoulti and I have a document that needs some polishing before we can share it.

[davido]

The question is whether or not this would affect current Bazel users, that rely on disc cache, e.g.: [1]. If yes, we would need a migration path and migration window.

• [1] https://github.com/GerritCodeReview/gerrit/blob/master/.bazelrc#L2

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