update ultravox model and config for v0.5 (#276)

Add whisper masking (#146)- Added masking in whisper encoder to ensure consistency in training and inference.- Simplified release_config.yaml to serve as an example configuration.

Make v0.4 release (#99)Two changes for training the ultravox v0.4 model:- Update the speech transcription instructions- Update the training config file to include more training dataCo-authored-by: Zhongqiang Huang <zhuang@fixie.ai>

Update default config to ultravox_v0.3 (#84)Add a release configuration to train `ultravox-v0_3` (https://huggingface.co/fixie-ai/ultravox-v0_3). Simply run `mcli run -f mcloud.yaml --follow` after following the instructions in README.md