Merge pull request #1011 from Automattic/wp-busybox #1015

Job	Run time
Prepare build matrix	3s
Build Docker image (ref: 6.7.1, tag: 6.7)	1m 11s
Build Docker image (ref: 6.6.2, tag: 6.6)	1m 12s
Build Docker image (ref: 6.5.5, tag: 6.5)	1m 19s
Build Docker image (ref: 6.4.5, tag: 6.4)	1m 39s
Build Docker image (ref: 6.3.5, tag: 6.3)	1m 36s
Build Docker image (ref: 6.2.6, tag: 6.2)	1m 43s
Build Docker image (ref: 6.1.7, tag: 6.1)	1m 15s
Build Docker image (ref: 6.0.9, tag: 6.0)	1m 11s
Build Docker image (ref: , tag: trunk)	1m 32s
	12m 41s

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