Enable multiple exporters (alternative) #2109

Job	Run time
prepare	1s
test / prepare	1m 42s
test / run (containerd, ./frontend/dockerfile, integration)	4m 43s
test / run (containerd, ./frontend/dockerfile, dockerfile)	7m 45s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 30s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 19s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 42s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 1s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	6m 59s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 15s
test / run (oci, ./frontend/dockerfile, integration)	3m 50s
test / run (oci, ./frontend/dockerfile, dockerfile)	4m 59s
test / run (oci-rootless, ./frontend/dockerfile, integration)	3m 51s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	4m 44s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	3m 53s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 13s
image (mainline)	4m 43s
image (labs)	4m 51s
release	0s
	1h 24m 1s

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