Rearranging instructions in dockerfiles #256

Job	Run time
Generate build matrix	6s
build-and-push-arena-images (images/base, base-on3.10-bullseye, on=3.10-bullseye)	1m 39s
build-and-push-arena-images (images/base, base-on3.9-bullseye, on=3.9-bullseye)	1m 52s
build-and-push-arena-images (images/base, base-on3.8-bullseye, on=3.8-bullseye)	1m 42s
build-and-push-arena-images (images/base, base-on3.7-bullseye, on=3.7-bullseye)	2m 22s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.10-bullseye, on=3.10-bullseye)	34m 20s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.9-bullseye, on=3.9-bullseye)	32m 17s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.8-bullseye, on=3.8-bullseye)	1h 4m 3s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.10-bullseye, on=3.10-bullseye)	27m 15s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.9-bullseye, on=3.9-bullseye)	28m 10s
build-and-push-arena-images (images/sheeprl, sheeprl-on3.8-bullseye, on=3.8-bullseye)	27m 40s
build-and-push-arena-images (images/stable-baselines, stable-baselines-on3.7-bullseye, on=3.7-bul...	7m 9s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.10-bullseye, on=3.10...	40m 24s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.9-bullseye, on=3.9-b...	27m 47s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.8-bullseye, on=3.8-b...	34m 49s
	5h 31m 35s

Provide feedback