GOLANGCI_LINT_CACHE change not documented

[rittneje]

We run golangci-lint in a docker container. Up through version 1.18.0, we just set GOCACHE to /tmp/.cache and everything worked fine. When upgrading to 1.19.0, it failed with a message "failed to initialize build cache at /.cache/golangci-lint: mkdir /.cache: permission denied". This seems to be because golangci-lint was changed to use GOLANGCI_LINT_CACHE for its cache directory, or os.UserCacheDir if that is not defined. But this change is not mentioned in the README or the release notes.

[stale]

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