feat: add form field validation in UI for bedrock byok (#4141)

letta/schemas/providers/bedrock.py

@@ -18,6 +18,7 @@ logger = get_logger(__name__)
 class BedrockProvider(Provider):
     provider_type: Literal[ProviderType.bedrock] = Field(ProviderType.bedrock, description="The type of the provider.")
     provider_category: ProviderCategory = Field(ProviderCategory.base, description="The category of the provider (base or byok)")
+    access_key: str = Field(..., description="AWS secret access key for Bedrock.")
     region: str = Field(..., description="AWS region for Bedrock")
 
     async def bedrock_get_model_list_async(self) -> list[dict]: