Merge pull request #6321 from ipfs/ci/golangci-lint

.circleci/config.yml

Rules.mk

cmd/ipfs/util/ulimit_test.go

core/builder.go

core/commands/block.go

core/corehttp/commands.go

core/coreunix/add_test.go

core/node/builder.go

core/node/storage.go

filestore/fsrefstore.go

go.mod

go.sum

mk/golang.mk

test/bin/Rules.mk

test/dependencies/dependencies.go