Update readme #281

Job	Run time
Generate build matrix	12s
build-and-push-arena-images (images/base, base-on3.10-bullseye, on=3.10-bullseye)	1m 37s
build-and-push-arena-images (images/base, base-on3.9-bullseye, on=3.9-bullseye)	2m 21s
build-and-push-arena-images (images/base, base-on3.8-bullseye, on=3.8-bullseye)	3m 8s
build-and-push-arena-images (images/base, base-on3.7-bullseye, on=3.7-bullseye)	3m 9s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.10-bullseye, on=3.10-bullseye)	29m 44s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.9-bullseye, on=3.9-bullseye)	27m 30s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.8-bullseye, on=3.8-bullseye)	30m 31s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.10-bullseye, on=3.10-bullseye)	25m 35s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.9-bullseye, on=3.9-bullseye)	30m 17s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.8-bullseye, on=3.8-bullseye)	26m 44s
build-and-push-arena-images (images/stable-baselines, stable-baselines-on3.7-bullseye, on=3.7-bul...	8m 53s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.10-bullseye, on=3.10...	25m 32s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.9-bullseye, on=3.9-b...	27m 7s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.8-bullseye, on=3.8-b...	29m 44s
	4h 32m 4s

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