k3s: use default buildGoModule #580

Job	Run time
lint (golangci-lint)	2s
lint (golangci-lint)	2s
build (nix-snapshotter)	1m 26s
build (nix-snapshotter)	1m 26s
build (image-hello)	1m 27s
build (image-hello)	1m 27s
build (image-redis)	1m 49s
build (image-redis)	1m 49s
build (image-redisWithShell)	1m 32s
build (image-redisWithShell)	1m 32s
integration-test (snapshotter)	5m 55s
integration-test (snapshotter)	5m 55s
integration-test (push-n-pull)	5m 30s
integration-test (push-n-pull)	5m 30s
integration-test (kubernetes)	6m 12s
integration-test (kubernetes)	6m 12s
integration-test (k3s)	30m 59s
integration-test (k3s)	22m 5s
integration-test (k3s-external)	30m 58s
integration-test (k3s-external)	30m 58s
integration-test (k3s-rootless)	30m 37s
integration-test (k3s-rootless)	30m 37s
integration-test (gvisor)	4m 56s
integration-test (gvisor)	4m 56s
coverage-report	0s
coverage-report	0s
	3h 53m 52s

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