Backport release_0.8.31 build pipeline updates to release_0.8.30

[yanghang8612]

Summary

• backport the five merged release_0.8.31 CI PRs (ci: sync GitHub build images with CircleCI #134 and ci: add Linux ARM64 release binary #137 through ci: use production S3 bucket for binary uploads #140) to release_0.8.30
• use the validated Linux and Emscripten build images
• add the Linux ARM64 release binary and solc-bin-compatible package path
• build only release compiler targets and move platform builds to GitHub-hosted runners
• keep the S3 packaging/upload job on the for-linux self-hosted runner
• use Node.js 24 artifact actions and the production S3 bucket

Source changes

• ci: sync GitHub build images with CircleCI #134: sync GitHub build images
• ci: add Linux ARM64 release binary #137: add Linux ARM64 release binary
• ci: streamline release builds on GitHub-hosted runners #138: streamline release builds on GitHub-hosted runners
• ci: fix S3 artifact handoff #139: fix the S3 artifact handoff
• ci: use production S3 bucket for binary uploads #140: use the production S3 bucket

The six source commits were cherry-picked in their original order. The resulting versions of .github/workflows/build.yml, .github/workflows/build.sh, and .github/workflows/build_win.ps1 match release_0.8.31 exactly.

Impact

This changes release artifact construction and upload only. It does not change compiler source code or compiler semantics. The workflow trigger already covers all release_* branches.

release_0.8.30 retains its existing CircleCI configuration; this backport adopts the already validated GitHub Actions release workflow from release_0.8.31 without importing unrelated upstream 0.8.31 CI changes.

Validation

• parsed .github/workflows/build.yml successfully as YAML
• bash -n passed for the GitHub Actions Unix and Emscripten build scripts
• git diff --check passed
• verified the upload job depends on Windows, macOS, Linux AMD64, Linux ARM64, and Emscripten artifacts
• verified ARM64 is included in the release tarballs, solc-bin layout, and S3 uploads
• ran the updated .github/workflows/build.sh locally with a Release configuration; the solc-only build completed and reported 0.8.30
• confirmed all three resulting workflow files are byte-for-byte identical to release_0.8.31

The platform-specific hosted-runner jobs and production S3 upload must run in GitHub Actions after merge; production secrets are not available to fork PR workflows.

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