Speed up the build process of Docker

### Description

Normally, the build process of Docker always takes at least 20 minutes, which is not efficient. Most of the cost is the `dependency:go-offline` step. We may need to cache these dependencies files through Docker cache, or support using the external `.m2` directory instead, so that we can speed up the Docker build process and improve the effect of development and deployment.

Start by locating the Docker build entry point and the dependency:go-offline step, then compare Docker cache handling with use of the external .m2 directory. Measure the current build time and dependency-download behavior; done means the Docker build is measurably faster without breaking development or deployment.

Written by the indexing model from the issue text.