refactor(release): stage app into dedicated dir for create-dmg

[rmarinsky]

Replaces post-export rm cleanup with a proper staging dir — copy only the .app into build/dmg-stage/, point create-dmg there. Same refactor going to Diduny and papuga.

Summary by CodeRabbit

• Chores
  • Optimized the release workflow to ensure only the application package is included in the final DMG distribution, excluding unnecessary build artifacts for cleaner releases.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ed02a702-0b38-4c52-8501-b19db9b07148

📥 Commits

Reviewing files that changed from the base of the PR and between 6117945 and 137f1cd.

📒 Files selected for processing (1)

• .github/workflows/release.yml

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📝 Walkthrough

Walkthrough

The release workflow's DMG creation is refactored to use a staged directory approach. Explicit cleanup of export artifacts is removed, replaced by a new staging step that copies only the exported .app bundle into build/dmg-stage, and the create-dmg tool now reads from this stage directory instead of the full export directory.

Changes

DMG Staging Pipeline

Layer / File(s)	Summary
DMG staging pipeline refactor .github/workflows/release.yml	Explicit deletion of export artifacts (DistributionSummary.plist, ExportOptions.plist, Packaging.log) is removed. A new staging step creates build/dmg-stage, clears it, and copies only the .app bundle into it. The create-dmg invocation is updated to use the staged directory path instead of the full export directory.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

📦 The DMG was cluttered, with artifacts galore,
Now staging cleans the clutter, keeping only the core,
One .app sits pristine, while build detritus stays,
A tidy workflow emerges, in cleaner ways! 🐰✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/dmg-staging-dir

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