Multiple exporter responses #5703

Job	Run time
build (windows/amd64)	1m 41s
build (freebsd/amd64)	1m 54s
sandbox-build (linux/amd64)	6m 43s
sandbox-build (linux/arm64)	6m 42s
test-freebsd-amd64	2m 24s
test-windows-amd64 (containerd, ./client)	6m 48s
test-windows-amd64 (containerd, ./cmd/buildctl)	2m 47s
test-windows-amd64 (containerd, ./worker/containerd)	4m 6s
test-windows-amd64 (containerd, ./solver)	3m 28s
test-windows-amd64 (containerd, ./frontend)	2m 36s
test-windows-amd64 (containerd, ./frontend/dockerfile)	42m 12s
test-windows-amd64 (./..., 1)	4m 7s
	1h 25m 28s

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