fix: docker frontend build system

[M0NsTeRRR]

Description

• Fix the build system by saving the build ID in a separate env file in the Docker-mounted folder. Placing the env file in the static folder allows users to mount only the static directory and, in a separate step, mount the required config files (config.yaml, device.yaml) for Kubernetes and GitOps setups.
• I've moved the env file creation to the end; in case there is an issue in the build generation, the build file is not generated, and the next restart will trigger a rebuild.
• There is an additional fix regarding the build id that also affects the current version and older ones wheremodel_dump keys are not sorted, which could trigger a rebuild if the keys were swapped compared to the last build.

Related Issues

Fixes #278

Motivation and Context

I want to speed up pod restarts in my Kubernetes environment, so I need to avoid rebuilding the frontend every time.

Tests

Tested in docker & kubernetes environment