Build

[docker] add mDNSResponder build option and s6-overlay service #9497

Job	Run time
pretty	2m 52s
rest-check (rest-off)	24m 18s
rest-check	24m 55s
check (Debug, mDNSResponder)	24m 47s
check (Release, openthread)	19m 25s
package	3m 27s
check (Release, mDNSResponder)	24m 59s
check (Debug, avahi)	22m 24s
check (Debug, openthread)	19m 32s
check (Release, avahi)	21m 51s
simulation	11m 10s
scan-build	2m 22s
script-check	5m 20s
	3h 27m 22s

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