feat: add minimal docker image build support and remove dashboard bui…

[404MaximWang]

Motivation / 动机

Provide a more lightweight Docker image.
提供更加轻量的镜像。

Remove redundant dashboard compilation steps in the workflow.
移除无用的Dashboard编译工作。

Modifications / 改动点

• Updated .github/workflows/docker-image.yml to remove unused dashboard build steps as the build artifacts were excluded by .dockerignore anyway.

• Added Dockerfile.minimal and updated the workflow to support building minimal images.

更改了.github/workflows/docker-image.yml；新增了Dockerfile.minimal

原docker-image.yml文件包含了编译dashboard的内容，然而编译结果的存放路径被列在.dockerignore文件中，也即编译结果不会被打包。本次修改移除了此内容。

增加了minimal镜像的打包工作流以提供更加轻量的镜像。

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

The result of local packaging is shown in the figure. The image size is significantly reduced.

本地打包得到的结果如图。镜像体积显著减小。

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Add support for building and publishing both standard and minimal Docker images while simplifying the Docker image workflows.

Enhancements:

• Introduce a minimal Docker image definition alongside the existing standard image.

CI:

• Update nightly and release Docker image workflows to build both standard and minimal variants using a matrix strategy and appropriately suffixed tags.
• Remove redundant dashboard build steps from Docker image workflows since their artifacts are not included in the image build context.

[sourcery-ai]

Hey - I've left some high level feedback:

• The strategy.matrix definitions for build-nightly-image and build-release-image are duplicated; consider extracting the matrix values (e.g., via YAML anchors or a reusable workflow input) to avoid divergence if the set of image types changes in the future.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `strategy.matrix` definitions for `build-nightly-image` and `build-release-image` are duplicated; consider extracting the matrix values (e.g., via YAML anchors or a reusable workflow input) to avoid divergence if the set of image types changes in the future.

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[gemini-code-assist]

Code Review

This pull request introduces a minimal multi-stage Dockerfile for AstrBot. The review identifies several critical improvements: copying the entire /usr/local/bin directory is risky and should be scoped, the pip installation commands can be consolidated into a single layer, the runtime dependency installation is largely redundant, and the cleanup of Python cache files should be handled via .dockerignore to effectively reduce image size.