Merge pull request #999 from Automattic/update/actions #998

Job	Run time
Prepare build matrix	2s
Build Docker image (ref: 6.7.1, tag: 6.7)	1m 28s
Build Docker image (ref: 6.6.2, tag: 6.6)	1m 24s
Build Docker image (ref: 6.5.5, tag: 6.5)	1m 28s
Build Docker image (ref: 6.4.5, tag: 6.4)	1m 28s
Build Docker image (ref: 6.3.5, tag: 6.3)	1m 26s
Build Docker image (ref: 6.2.6, tag: 6.2)	1m 29s
Build Docker image (ref: 6.1.7, tag: 6.1)	1m 24s
Build Docker image (ref: 6.0.9, tag: 6.0)	1m 46s
Build Docker image (ref: HEAD, tag: trunk)	9m 45s
	21m 40s

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