feat: thread autoscaling #1884

Job	Run time
prepare	19s
build (php-8-2-27-alpine, linux/amd64)	7m 46s
build (php-8-2-27-alpine, linux/386)	8m 28s
build (php-8-2-27-alpine, linux/arm/v7)	13m 13s
build (php-8-2-27-alpine, linux/arm64)	14m 48s
build (php-8-2-27-bookworm, linux/amd64)	8m 57s
build (php-8-2-27-bookworm, linux/386)	5m 45s
build (php-8-2-27-bookworm, linux/arm/v7)	14m 33s
build (php-8-2-27-bookworm, linux/arm64)	14m 32s
build (php-8-3-15-alpine, linux/amd64)	9m 15s
build (php-8-3-15-alpine, linux/386)	8m 29s
build (php-8-3-15-alpine, linux/arm/v7)	13m 8s
build (php-8-3-15-alpine, linux/arm64)	23m 6s
build (php-8-3-15-bookworm, linux/amd64)	9m 13s
build (php-8-3-15-bookworm, linux/386)	5m 6s
build (php-8-3-15-bookworm, linux/arm/v7)	15m 18s
build (php-8-3-15-bookworm, linux/arm64)	15m 5s
build (php-8-4-2-alpine, linux/amd64)	6m 20s
build (php-8-4-2-alpine, linux/386)	5m 22s
build (php-8-4-2-alpine, linux/arm/v7)	13m 19s
build (php-8-4-2-alpine, linux/arm64)	23m 13s
build (php-8-4-2-bookworm, linux/amd64)	8m 46s
build (php-8-4-2-bookworm, linux/386)	6m 41s
build (php-8-4-2-bookworm, linux/arm/v7)	15m 8s
build (php-8-4-2-bookworm, linux/arm64)	14m 58s
push	0s
	4h 40m 48s

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