fix: update EnvArgsSpec to require value field and add exposed_name alias

Author: guptadev21

rapyuta_io_sdk_v2/models/deployment.py

@@ -39,7 +39,9 @@ class DeploymentMetadata(BaseMetadata):
 
 class EnvArgsSpec(BaseModel):
     name: str
-    value: str | None = None
+    value: str
+    exposed: bool | None = None
+    exposed_name: str | None = Field(default=None, alias='exposedName')
 
 
 class DeploymentVolume(BaseModel):