fix: add merge-lora arg for model id #2788
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This PR fixes an issue when loading a lora adapter via
--model-idand not--lora-adapters.context
Prior to multi lora, if an adapter was specified as the model id, TGI would automatically merge the base model with the adapter weights and resave the merged model under the adapter id. Multi-lora requires the weights to be unmerged - so it can dynamically apply the adapter at runtime. If the adapter is mutated/merged than it no longer can be used with multi-lora. Due to this fact, merging by default was disabled with multi lora. In order to merge weights a
--merge-loraflag must be used when callingdownload-weights. This PR removes that requirement and will automatically merge the weights if no adapters are supplies. NOTE*** once merged the adapter will no longer be useable with mutli-lora (and you'll need to redownload the adapter only)