[ios] Preserve bcsymbolmap files when using CocoaPods

Bitcode symbol map files (`bcsymbolmap`) are used in conjunction with dSYMs to symbolicate crashes. CocoaPods doesn't yet preserve these or add them to an app's `xcarchive`, so the developer needs to do this themselves (typically as an install-only build copy phase).

platform/ios/CHANGELOG.md

@@ -4,6 +4,10 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
 
 ## 4.2.0
 
+### Packaging
+
+* When integrating this framework using CocoaPods, the included bcsymbolmap files are now preserved. If you have bitcode enabled and you are seeing incorrectly symbolicated crash logs, you should create a build phase in your Xcode project that copies these bcsymbolmap files to your app’s Products Directory when installing. ([#12257](https://github.com/mapbox/mapbox-gl-native/pull/12257))
+
 ### Styles and rendering
 
 * Added an `MGLRasterStyleLayer.rasterResamplingMode` property for configuring how raster style layers are overscaled. ([#12176](https://github.com/mapbox/mapbox-gl-native/pull/12176))

platform/ios/Mapbox-iOS-SDK-nightly-dynamic.podspec

@@ -27,4 +27,6 @@ Pod::Spec.new do |m|
   m.vendored_frameworks = 'dynamic/Mapbox.framework'
   m.module_name = 'Mapbox'
 
+  m.preserve_path = '**/*.bcsymbolmap'
+
 end

platform/ios/Mapbox-iOS-SDK-symbols.podspec

@@ -27,4 +27,6 @@ Pod::Spec.new do |m|
   m.vendored_frameworks = 'dynamic/Mapbox.framework'
   m.module_name = 'Mapbox'
 
+  m.preserve_path = '**/*.bcsymbolmap'
+
 end

platform/ios/Mapbox-iOS-SDK.podspec

@@ -27,4 +27,6 @@ Pod::Spec.new do |m|
   m.vendored_frameworks = 'dynamic/Mapbox.framework'
   m.module_name = 'Mapbox'
 
+  m.preserve_path = '**/*.bcsymbolmap'
+
 end