Fix permissions on cache when --no-push is set #1445
Merged
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Fixes #1265
Description
Since pre-configuration of gcr credential helper was removed on v0.20.0, when using --no-push along with --cache, the credentials were never configured for the cache repo hence making both retrieving and pushing layers fails.
Proposing solution is: If --no-push is set, instead of not checking push permissions, we check if the --cache-repo has permissions.
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