add badge to README #151

Job	Run time
docker (8.3:latest)	10m 54s
docker (8.3-ci:8.3-ci)	16m 51s
docker (8.3:8.3)	10m 58s
docker (8.3-frankenphp-bookworm:8.3-frankenphp-bookworm)	11m 53s
docker (8.3-symfony:8.3-symfony)	18m 3s
docker (8.2-ci:8.2-ci)	15m 21s
docker (8.2:8.2)	10m 46s
docker (8.2-frankenphp-bookworm:8.2-frankenphp-bookworm)	10m 56s
docker (8.2-symfony:8.2-symfony)	16m 17s
docker (8.1-ci:8.1-ci)	14m 49s
docker (8.1:8.1)	10m 59s
docker (8.1-symfony:8.1-symfony)	16m 18s
	2h 44m 5s

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