Add possibility for signed firmware updates

backend/app/schemas/firmware_update.py

@@ -28,6 +28,8 @@ class FirmwareUpdateBase(BaseModel):
     location: str
     retrieve_date_time: datetime
     install_date_time: Optional[datetime]
+    signing_certificate: Optional[str]
+    signature: Optional[str]
 
 class FirmwareUpdate(FirmwareUpdateBase):
     id: UUID
@@ -38,5 +40,4 @@ class FirmwareUpdateCreate(FirmwareUpdateBase):
     pass
 
 class FirmwareUpdateSubmissionResponse(BaseModel):
-    firmware_update: FirmwareUpdate
     status: str