Adds basic file watcher #1428

Job	Run time
prepare	8s
build (php-8-2-24-alpine, linux/amd64)	16m 28s
build (php-8-2-24-alpine, linux/386)	12m 13s
build (php-8-2-24-alpine, linux/arm/v7)	48m 48s
build (php-8-2-24-alpine, linux/arm64)	59m 15s
build (php-8-2-24-bookworm, linux/amd64)	5m 10s
build (php-8-2-24-bookworm, linux/386)	4m 22s
build (php-8-2-24-bookworm, linux/arm/v7)	15m 26s
build (php-8-2-24-bookworm, linux/arm64)	14m 31s
build (php-8-3-12-alpine, linux/amd64)	12m 26s
build (php-8-3-12-alpine, linux/386)	11m 55s
build (php-8-3-12-alpine, linux/arm/v7)	45m 10s
build (php-8-3-12-alpine, linux/arm64)	49m 13s
build (php-8-3-12-bookworm, linux/amd64)	5m 1s
build (php-8-3-12-bookworm, linux/386)	4m 13s
build (php-8-3-12-bookworm, linux/arm/v7)	16m 13s
build (php-8-3-12-bookworm, linux/arm64)	15m 29s
push	0s
	5h 36m 1s

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