[Advancement] Publish verified Docker images with multi-arch support

[Nanle-code]

Objective

Publish multi-arch Docker images for StarForge CLI with signatures/checksums.

Target area

Dockerfile, release workflow

Context

Container distribution helps CI users pin tooling reproducibly.

Requirements

• Build amd64 and arm64 images
• Sign or checksum tags
• Document recommended CI usage

Acceptance criteria

• Multi-arch images published on release
• Verification steps documented
• Image runs starforge --version in smoke test

Pull request merge requirements

Pull requests that resolve this issue must not be merged until all of the following are true:

1. All required CI checks are green on the latest commit of the PR (build, tests, lint/format, and any workflow jobs required by branch protection).
2. The branch has no merge conflicts with the target branch (master / default), and a clean merge or rebase is possible without unresolved conflicts.
3. Review feedback is addressed, and the change remains focused on this issue’s acceptance criteria.

Contributors should run the local CI-equivalent checks before opening or updating the PR (see CI_ENFORCEMENT.md and CONTRIBUTING.md).

[Jumongweb]

@Jumongweb has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, i will like solve this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Jumongweb to this issue.