* Cache Swift packages across CI runs
Add actions/cache for the SPM cloned source packages directory so
subsequent runs skip fetching Sparkle, sentry-cocoa, swift-markdown-ui,
posthog-ios, and NetworkImage from GitHub each time.
- nightly/release: replace the no-op SwiftPM cache step with
actions/cache + -clonedSourcePackagesDirPath on xcodebuild
- ci/ci-macos-compat/test-e2e: add actions/cache before the existing
resolve step, stop deleting the cache dir each run
* Include runner in test-e2e cache key
Consistent with ci-macos-compat.yml which uses matrix.os in the key.
* Add macOS compatibility CI: unit tests + smoke test on macos-14/15
New workflow runs on GitHub-hosted macos-14 and macos-15 runners
(matrix strategy). Each run: unit tests via cmux-unit scheme, then
a smoke test that builds the app, launches it, sends a command via
the socket, and verifies it stays alive for 15 seconds.
* Select latest Xcode on runner (fix macos-14 Swift tools version)
macos-14 runners default to Xcode 15.4, but sentry-cocoa needs
Swift tools version 6.0 (Xcode 16+). Pick the latest Xcode_*.app
instead of the default symlink.
* Launch app binary directly in smoke test for better CI compatibility
Using `open` can fail silently on CI runners. Launch the binary
directly with env vars set, capture stdout/stderr, and add process
health checks with diagnostic output (debug log tail, crash reports)
on failure.
