refactor: merge `dev-tools` into `wordpress` #1033

Job	Run time
Prepare build matrix	3s
Build Docker image (ref: 6.7.1, tag: 6.7)	1m 21s
Build Docker image (ref: 6.6.2, tag: 6.6)	1m 14s
Build Docker image (ref: 6.5.5, tag: 6.5)	1m 1s
Build Docker image (ref: 6.4.5, tag: 6.4)	1m 13s
Build Docker image (ref: 6.3.5, tag: 6.3)	1m 14s
Build Docker image (ref: 6.2.6, tag: 6.2)	58s
Build Docker image (ref: 6.1.7, tag: 6.1)	1m 0s
Build Docker image (ref: 6.0.9, tag: 6.0)	1m 13s
Build Docker image (ref: , tag: trunk)	1m 30s
	10m 47s

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