ci: add x86_64-apple-darwin lane (Linux cross via mac_cross_linux)

[zackees]

soldr#1006 Lane 3. Closes the easiest remaining gap — x86_64-apple-darwin built from ubuntu-latest via the existing mac_cross_linux: true template branch. Renames ci/docker-mac-arm64-cross → ci/docker-mac-cross since the same image now validates both Apple targets.

Local docker validation in progress in parallel; verifies 3 Mach-O x86_64 artifacts under staging/.

Summary by CodeRabbit

• New Features

  • Added support for building release binaries for both Apple Silicon and Intel macOS targets.
  • Expanded release automation to cover the x86_64-apple-darwin cross-build path.

• Bug Fixes

  • Improved binary validation so packaged macOS artifacts are checked against the expected architecture before release.
  • Updated build instructions and verification steps to match the broader macOS cross-build flow.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 865e2996-8846-4490-84e1-b1e50202db8f

📥 Commits

Reviewing files that changed from the base of the PR and between af788a6 and 4383991.

📒 Files selected for processing (5)

• .github/workflows/release-auto.yml
• .github/workflows/template_native_build.yml
• ci/docker-mac-cross/Dockerfile
• ci/docker-mac-cross/README.md
• ci/docker-mac-cross/build.sh

---

📝 Walkthrough

Walkthrough

The PR extends the macOS cross-compilation infrastructure to support x86_64-apple-darwin in addition to aarch64-apple-darwin. ci/docker-mac-cross/build.sh gains configurable TARGET selection and per-target Mach-O verification. The release workflow matrix gains an x86_64-apple-darwin entry, and Dockerfile/README docs are updated to cover both targets.

Changes

x86_64-apple-darwin cross-compilation support

Layer / File(s)	Summary
Configurable TARGET in build.sh ci/docker-mac-cross/build.sh	TARGET is now read from a positional arg or env var (defaulting to aarch64-apple-darwin), validated via case, and used to set MACHO_ARCH_PATTERN. The verification loop checks all three staged artifacts (fbuild, fbuild-daemon, _native.abi3.so) against the dynamic pattern.
CI matrix entry and workflow comment .github/workflows/release-auto.yml, .github/workflows/template_native_build.yml	Adds x86_64-apple-darwin as a new build matrix include using the mac_cross_linux lane. Updates inline comment to reference ci/docker-mac-cross/build.sh.
Dockerfile and README docs ci/docker-mac-cross/Dockerfile, ci/docker-mac-cross/README.md	Header comments, example docker build/docker run commands, and verification descriptions updated to cover both Apple targets and show the x86_64-apple-darwin argument.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• FastLED/fbuild#16: Directly intersects — cross-builds and stages the same _native.abi3.so for x86_64-apple-darwin.
• FastLED/fbuild#771: Introduced the mac_cross_linux path in template_native_build.yml that this PR extends to support x86_64.

Poem

🐇 Hop hop, two targets now!
ARM and Intel, both get the Mach-O vow.
No cheating with ELF, the file command sees,
Cross-compiled binaries dancing with ease.
One script to rule them both — what a feat! 🍎

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/linux-cross-mac-x86

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}