ci: cross-compile all six binaries in one ubuntu job with CGO_ENABLED=0

[gmegidish]

Summary

• Replaces build_on_macos, build_on_linux and build_on_windows with a single build job on ubuntu-latest that cross-compiles all six binaries (darwin, linux, windows × arm64, amd64).
• Every binary is now built with CGO_ENABLED=0, matching the Makefile. Previously only the linux builds set it. The repo has no cgo code, so nothing needs the target OS toolchain.
• Artifact names (macos-build, linux-build, windows-build) and file names are unchanged, so e2e_test and publish only change their needs:.
• Drops the unused goimports / golangci-lint installs from the old build jobs.
• The windows artifact now has retention-days: 1 like the others.

The iOS agent dylib is still built on macos-latest (build_ios_agents).

Test plan

• All six targets cross-compile locally with CGO_ENABLED=0 (from macOS)
• build job passes on ubuntu
• e2e_test passes on the self-hosted Mac, which runs the ubuntu-built mobilecli-darwin-arm64
• linux arm64, darwin amd64 and both windows binaries are not executed anywhere in CI yet

Summary by CodeRabbit

• New Features
  • Release builds now provide separate binaries for macOS, Linux, and Windows on both ARM64 and AMD64.
• Improvements
  • Release publishing now waits for the cross-platform build to complete, helping ensure the platform binaries are ready before publication.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: mobile-next/mobilecli/.coderabbit.yaml
• Review profile: CHILL
• Plan: Essentials
• Run ID: 17df3eee-d5b4-40ad-8c11-59b9b8a402d1

📥 Commits

Reviewing files that changed from the base of the PR and between d3f4653 and acb4efd.

📒 Files selected for processing (1)

• .github/workflows/build.yml

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📝 Walkthrough

Walkthrough

The workflow replaces separate macOS, Linux, and Windows build jobs with one Ubuntu job. It cross-compiles binaries for Darwin, Linux, and Windows on arm64 and amd64, uploads platform artifacts, and updates the build dependencies for e2e testing and publishing.

Changes

Cross-platform build workflow

Layer / File(s)	Summary
Unified cross-platform build .github/workflows/build.yml	The Ubuntu job validates tag versions, sets the version with Linux-compatible sed, and cross-compiles for Darwin, Linux, and Windows on arm64 and amd64. It checks the Linux amd64 binary version.
Artifact uploads and job dependencies .github/workflows/build.yml	The unified job uploads platform artifacts. e2e_test and publish depend on the unified build job. publish retains its dependencies on tests, lint, and security.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to acb4e

The unified build completed successfully with time to spare. No identified issue prevents merging after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: cross-compiling all six binaries in one Ubuntu job with CGO disabled.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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