Tests

ignore exec.ErrDot when starting caddy in background #5741

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Run time

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Job	Run time
goreleaser-check	12s
test (s390x on IBM Z)	53s
test (linux, 1.21)	1m 14s
test (linux, 1.22)	2m 4s
test (mac, 1.21)	1m 20s
test (mac, 1.22)	1m 51s
test (windows, 1.21)	5m 41s
test (windows, 1.22)	6m 16s
	19m 31s