Merge pull request #1012 from Automattic/update/build-image-action #1018

Job	Run time
Prepare build matrix	8s
Build Docker image (ref: 6.7.1, tag: 6.7)	1m 12s
Build Docker image (ref: 6.6.2, tag: 6.6)	1m 10s
Build Docker image (ref: 6.5.5, tag: 6.5)	1m 7s
Build Docker image (ref: 6.4.5, tag: 6.4)	1m 11s
Build Docker image (ref: 6.3.5, tag: 6.3)	1m 11s
Build Docker image (ref: 6.2.6, tag: 6.2)	1m 7s
Build Docker image (ref: 6.1.7, tag: 6.1)	1m 11s
Build Docker image (ref: 6.0.9, tag: 6.0)	1m 9s
Build Docker image (ref: , tag: trunk)	1m 51s
	11m 17s

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