ci: cache CI dependencies to reduce PR workflow runtime

[nickolas-dimitrakas]

Background

PR workflow jobs in `build-kits` were taking 15-19 minutes each because third-party SDKs (Firebase, Airship, Rokt) were being downloaded and compiled from scratch on every run with no caching.

Profiled from CI run #24418060388:

Job	Duration
Pod Lint urbanairship-19	18m 55s
Build firebase-ga4-12	17m 49s
Build firebase-ga4-11	16m 23s
Build firebase-11	15m 59s
Build urbanairship-20	15m 13s
Build rokt	13m 6s

What Has Changed

build-kits.yml

• Added actions/cache@v5.0.5 for ~/.cocoapods and ~/Library/Caches/CocoaPods in pod-lint-kits, keyed per-kit by podspec hash + weekly window — avoids re-downloading Airship/Firebase on every lint run; weekly window ensures new upstream releases are picked up
• Added full DerivedData cache in build-kits, key computed via shell find | shasum across kit source files + core SDK source files (mParticle-Apple-SDK/**, mParticle-Apple-SDK-Swift/**) — enables incremental xcodebuild instead of full recompilation on warm runs; busts on any kit or core SDK change
• Added timeout-minutes: 30 to both pod-lint-kits and build-kits jobs to enforce the target CI runtime
• Reduced fetch-depth from 0 → 1 (full git history not needed for builds)

build-and-lint.yml

• Added gem cache (~/.gem) for xcodeproj; switched to user-level gem install

cross-platform-tests.yml

• Added gem cache (~/.gem) for cocoapods + cocoapods-generate, keyed by Podfile.lock

integration-tests.yml

• Added actions/cache@v5.0.5 for WireMock JAR, keyed by version — skips Maven Central download on cache hit

All actions/cache references pinned to SHA (v5.0.5).

Screenshots/Video

N/A

Checklist

• Self-review completed
• Tests added or updated
• Tested locally

Additional Notes

Cold runs (first PR after a cache miss) remain as today. On warm runs (no source changes), kit builds should drop from 15-18 min to ~2-5 min via incremental xcodebuild. Monitor GitHub Actions cache storage in Settings → Actions → Caches — Firebase DerivedData is large (1-3 GB per kit) and may approach the 10 GB repo limit.

[github-actions]

📦 SDK Size Impact Report

Measures how much the SDK adds to an app's size (with-SDK minus without-SDK).

Metric	Target Branch	This PR	Change
App Bundle Impact	1.75 MB	1.75 MB	+N/A
Executable Impact	848 bytes	848 bytes	+N/A
XCFramework Size	6.38 MB	6.38 MB	+N/A

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (main):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1876,"with_sdk_executable_size_bytes":76312,"sdk_impact_kb":1792,"sdk_executable_impact_bytes":848,"xcframework_size_kb":6528}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1876,"with_sdk_executable_size_bytes":76312,"sdk_impact_kb":1792,"sdk_executable_impact_bytes":848,"xcframework_size_kb":6528}