Adds basic file watcher #1403

Job	Run time
prepare	16s
build (php-8-2-24-alpine, linux/amd64)	10m 49s
build (php-8-2-24-alpine, linux/386)	8m 48s
build (php-8-2-24-alpine, linux/arm/v7)	48m 17s
build (php-8-2-24-alpine, linux/arm64)	53m 54s
build (php-8-2-24-bookworm, linux/amd64)	4m 24s
build (php-8-2-24-bookworm, linux/386)	2m 54s
build (php-8-2-24-bookworm, linux/arm/v7)	13m 18s
build (php-8-2-24-bookworm, linux/arm64)	12m 48s
build (php-8-3-12-alpine, linux/amd64)	7m 56s
build (php-8-3-12-alpine, linux/386)	7m 20s
build (php-8-3-12-alpine, linux/arm/v7)	47m 55s
build (php-8-3-12-alpine, linux/arm64)	50m 47s
build (php-8-3-12-bookworm, linux/amd64)	3m 44s
build (php-8-3-12-bookworm, linux/386)	3m 10s
build (php-8-3-12-bookworm, linux/arm/v7)	13m 27s
build (php-8-3-12-bookworm, linux/arm64)	13m 53s
push	1s
	5h 3m 41s

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