build

driver: make buildkitd "config" and "flags" names consistent #3329

Job	Run time
prepare-test-integration	1m 38s
prepare-binaries	8s
buildkit-edge	1m 29s
test-unit (ubuntu-22.04)	38s
test-unit (macos-12)	2m 17s
test-unit (windows-2022)	3m 25s
binaries (darwin/amd64)	1m 24s
binaries (darwin/arm64)	1m 31s
binaries (linux/amd64)	1m 27s
binaries (linux/arm/v6)	1m 29s
binaries (linux/arm/v7)	1m 21s
binaries (linux/arm64)	1m 32s
binaries (linux/ppc64le)	1m 31s
binaries (linux/riscv64)	1m 38s
binaries (linux/s390x)	1m 29s
binaries (windows/amd64)	1m 30s
binaries (windows/arm64)	1m 21s
test-integration (docker, ./tests)	4m 29s
test-integration (docker\+containerd, ./tests)	4m 23s
test-integration (docker-container, ./tests)	4m 56s
test-integration (remote, ./tests)	2m 30s
release	16s
bin-image	0s
	42m 22s

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