feat: thread autoscaling #1827

Job	Run time
prepare	14s
build (php-8-2-26-alpine, linux/amd64)	4m 36s
build (php-8-2-26-alpine, linux/386)	5m 30s
build (php-8-2-26-alpine, linux/arm/v7)	39m 34s
build (php-8-2-26-alpine, linux/arm64)	39m 34s
build (php-8-2-26-bookworm, linux/amd64)	3m 52s
build (php-8-2-26-bookworm, linux/386)	3m 7s
build (php-8-2-26-bookworm, linux/arm/v7)	17m 21s
build (php-8-2-26-bookworm, linux/arm64)	16m 22s
build (php-8-3-14-alpine, linux/amd64)	7m 56s
build (php-8-3-14-alpine, linux/386)	5m 42s
build (php-8-3-14-alpine, linux/arm/v7)	39m 31s
build (php-8-3-14-alpine, linux/arm64)	39m 33s
build (php-8-3-14-bookworm, linux/amd64)	3m 50s
build (php-8-3-14-bookworm, linux/386)	3m 3s
build (php-8-3-14-bookworm, linux/arm/v7)	17m 39s
build (php-8-3-14-bookworm, linux/arm64)	2m 51s
build (php-8-4-1-alpine, linux/amd64)	8m 2s
build (php-8-4-1-alpine, linux/386)	5m 28s
build (php-8-4-1-alpine, linux/arm/v7)	39m 33s
build (php-8-4-1-alpine, linux/arm64)	39m 32s
build (php-8-4-1-bookworm, linux/amd64)	7m 54s
build (php-8-4-1-bookworm, linux/386)	3m 13s
build (php-8-4-1-bookworm, linux/arm/v7)	17m 17s
build (php-8-4-1-bookworm, linux/arm64)	17m 10s
push	1s
	6h 28m 25s

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