Add DS-Chat CI workflow (#4127)
* Add DS Chat CI workflow
* Add CRITIC_CKPT_DIR env variable to actions.yml
* Update step 2 opt 125m ckpt dir name
* Update test dir
* Add workflow_dispatch
* Add :
* Add nv-ds-chat badge to main README
* Open GH issue if DS Chat CI fails
* Remove pull_request and merge_group conditions
* Update and test torch version
* Remove PR trigger
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Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>
