feat: thread autoscaling #1883

Job	Run time
prepare	11s
build (php-8-2-27-alpine, linux/amd64)	4m 12s
build (php-8-2-27-alpine, linux/386)	3m 24s
build (php-8-2-27-alpine, linux/arm/v7)	5m 3s
build (php-8-2-27-alpine, linux/arm64)	5m 3s
build (php-8-2-27-bookworm, linux/amd64)	3m 51s
build (php-8-2-27-bookworm, linux/386)	3m 36s
build (php-8-2-27-bookworm, linux/arm/v7)	5m 4s
build (php-8-2-27-bookworm, linux/arm64)	5m 2s
build (php-8-3-15-alpine, linux/amd64)	4m 8s
build (php-8-3-15-alpine, linux/386)	3m 25s
build (php-8-3-15-alpine, linux/arm/v7)	5m 4s
build (php-8-3-15-alpine, linux/arm64)	5m 4s
build (php-8-3-15-bookworm, linux/amd64)	3m 50s
build (php-8-3-15-bookworm, linux/386)	3m 4s
build (php-8-3-15-bookworm, linux/arm/v7)	5m 2s
build (php-8-3-15-bookworm, linux/arm64)	5m 2s
build (php-8-4-2-alpine, linux/amd64)	4m 11s
build (php-8-4-2-alpine, linux/386)	4m 9s
build (php-8-4-2-alpine, linux/arm/v7)	5m 3s
build (php-8-4-2-alpine, linux/arm64)	5m 3s
build (php-8-4-2-bookworm, linux/amd64)	3m 47s
build (php-8-4-2-bookworm, linux/386)	3m 5s
build (php-8-4-2-bookworm, linux/arm/v7)	5m 2s
build (php-8-4-2-bookworm, linux/arm64)	5m 1s
push	1s
	1h 45m 27s

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