Proposal: add build args to docker-build action

Currently, our docker-build action does not support passing --build-arg parameters to the docker build command. This limits our ability to dynamically inject build-time variables such as environment configurations, secrets (via build-time only secrets), or versioning metadata.

Proposal:

Add support for build arguments by introducing an optional build-args input to the action. This input could accept a list or key-value pairs, which the action will forward to the docker build command using --build-arg.

Example usage:

with:
  build-args: |
    ENV=production
    VERSION=1.2.3

This enhancement would improve flexibility and align the action with common Docker build practices.

定位 docker-build action 的定义以及它调用的 docker build 命令。添加采用建议的 ENV=production 格式的可选 build-args 输入，将每个参数作为 --build-arg 传递，并验证不提供该输入时构建仍能正常工作。