ci: Run on `main` (#464) #508

Job	Run time
pre-flight	1s
build-container / main	13s
dpo-llama3-pack / main	3m 3s
dpo-llama3 / main	2m 46s
kd-llama3 / main	3m 7s
ppo-llama3-pp2-reshard / main	2m 49s
reinforce-llama3-pp2-reshard / main	2m 46s
rm-llama3 / main	2m 5s
sft-llama3 / main	2m 34s
run_mpi_unit.sh / main	2m 17s
run_unit.sh / main	2m 26s
CI quality check	1s
	24m 8s

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