Custom code in dev-container (frappe_docker) not similar code in local container when i build

Frappe Framework
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i follow this topic Overview Frappe, Docker, self-hosting - Install / Update / Deployment - Frappe Forum
first, i custom code in dev container
second, i build image and use this by docker compose like tutorial but when i docker exec and view my code, all custom code in dev container is not writen in

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