Update readme #280

Job	Run time
Generate build matrix	7s
build-and-push-arena-images (images/base, base-on3.10-bullseye, on=3.10-bullseye)	2m 27s
build-and-push-arena-images (images/base, base-on3.9-bullseye, on=3.9-bullseye)	1m 43s
build-and-push-arena-images (images/base, base-on3.8-bullseye, on=3.8-bullseye)	1m 36s
build-and-push-arena-images (images/base, base-on3.7-bullseye, on=3.7-bullseye)	1m 55s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.10-bullseye, on=3.10-bullseye)	27m 11s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.9-bullseye, on=3.9-bullseye)	39m 7s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.8-bullseye, on=3.8-bullseye)	40m 46s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.10-bullseye, on=3.10-bullseye)	38m 28s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.9-bullseye, on=3.9-bullseye)	28m 46s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.8-bullseye, on=3.8-bullseye)	34m 15s
build-and-push-arena-images (images/stable-baselines, stable-baselines-on3.7-bullseye, on=3.7-bul...	8m 3s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.10-bullseye, on=3.10...	55m 6s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.9-bullseye, on=3.9-b...	54m 41s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.8-bullseye, on=3.8-b...	25m 49s
	6h 0m 0s

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