add macos CI build

[Huibean]

• add macos CI build .dmg

[Copilot]

Pull request overview

Adds macOS CI support to build a distributable .app bundle and package it into a .dmg artifact for DroneCAN GUI Tool.

Changes:

• Introduce a py2app build configuration for creating a macOS .app.
• Add a macOS build script to produce a .dmg in dist/.
• Add a GitHub Actions workflow to run the macOS build and upload the .dmg artifact.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

File	Description
setup_mac.py	Adds py2app setup configuration for building a macOS app bundle.
macbuild.sh	Automates venv setup, py2app build, and DMG packaging.
.github/workflows/macbuild.yml	Adds a macOS CI job to run the build script and upload the DMG.

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[Copilot]

The DMG packaging step references dist/${APP_NAME}.app, but py2app names the output bundle directory from the entry script basename (bin/dronecan_gui_tool), so the generated bundle path will be dist/dronecan_gui_tool.app by default. This will cause the hdiutil create step to fail in CI unless the source folder path is updated (or the py2app config is changed to emit the expected bundle name).

[Huibean]

Hi @tridge , can you have a look on this, I have tested the CI build dmg, it is working