ci: Run on `main` #507

Job	Run time
pre-flight	5s
build-container / main	1m 23s
ppo-llama3-pp2-reshard / main	2m 48s
dpo-llama3-pack / main	3m 19s
dpo-llama3 / main	2m 47s
kd-llama3 / main	3m 8s
reinforce-llama3-pp2-reshard / main	2m 46s
rm-llama3 / main	2m 5s
sft-llama3 / main	2m 35s
run_mpi_unit.sh / main	2m 17s
run_unit.sh / main	2m 27s
CI quality check	1s
	25m 41s

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