Merge pull request #964 from Automattic/dependabot/github_actions/dot… #974

Job	Run time
Prepare build matrix	4s
Build Docker image (ref: 6.7.1, tag: 6.7)	1m 26s
Build Docker image (ref: 6.6.2, tag: 6.6)	1m 42s
Build Docker image (ref: 6.5.5, tag: 6.5)	1m 10s
Build Docker image (ref: 6.4.5, tag: 6.4)	1m 18s
Build Docker image (ref: 6.3.5, tag: 6.3)	1m 42s
Build Docker image (ref: 6.2.6, tag: 6.2)	1m 40s
Build Docker image (ref: 6.1.7, tag: 6.1)	1m 14s
Build Docker image (ref: HEAD, tag: trunk)	2m 13s
	12m 29s

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