Merge pull request #874 from Automattic/dependabot/github_actions/dot… #868

Job	Run time
Prepare build matrix	2s
Build Docker image (ref: 6.6.1, tag: 6.6)	1m 47s
Build Docker image (ref: 6.5.5, tag: 6.5)	1m 18s
Build Docker image (ref: 6.4.5, tag: 6.4)	1m 47s
Build Docker image (ref: 6.3.5, tag: 6.3)	1m 16s
Build Docker image (ref: 6.2.6, tag: 6.2)	1m 40s
Build Docker image (ref: 6.1.7, tag: 6.1)	1m 43s
Build Docker image (ref: 6.0.9, tag: 6.0)	1m 16s
Build Docker image (ref: HEAD, tag: trunk)	3m 48s
	14m 37s

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