Build images only when they change #424

Job	Run time
buildx (php, 8.4-fpm-5, images/8.4-fpm)	56m 44s
buildx (php, 8.4-apache-5, images/8.4-apache)	55m 48s
buildx (php, 8.3-fpm-5, images/8.3-fpm)	1h 6m 3s
buildx (php, 8.3-apache-5, images/8.3-apache)	1h 6m 33s
buildx (php, 8.2-fpm-5, images/8.2-fpm)	1h 2m 30s
buildx (php, 8.2-apache-5, images/8.2-apache)	1h 1m 54s
buildx (php, 8.1-fpm-5, images/8.1-fpm)	1h 3m 2s
buildx (php, 8.1-apache-5, images/8.1-apache)	1h 0m 37s
buildx (php, 8.0-fpm-5, images/8.0-fpm)	21s
buildx (php, 8.0-apache-5, images/8.0-apache)	23s
buildx (php, 7.4-fpm-5, images/7.4-fpm)	33s
buildx (php, 7.4-apache-5, images/7.4-apache)	37s
buildx (php, 7.3-fpm-5, images/7.3-fpm)	32s
buildx (php, 7.3-apache-5, images/7.3-apache)	34s
buildx (php, 7.2-fpm-5, images/7.2-fpm)	18s
buildx (php, 7.2-apache-5, images/7.2-apache)	23s
buildx (php, 7.1-fpm-5, images/7.1-fpm)	1h 7m 6s
buildx (php, 7.1-apache-5, images/7.1-apache)	1h 7m 26s
buildx (php, 7.0-fpm-5, images/7.0-fpm)	59m 42s
buildx (php, 7.0-apache-5, images/7.0-apache)	59m 38s
buildx (php, 5.6-fpm-5, images/5.6-fpm)	23s
buildx (php, 5.6-apache-5, images/5.6-apache)	32s
	12h 31m 39s

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