ci: add Swift and Kotlin example builds

Author: chipp

.github/workflows/ci.yml

@@ -133,6 +133,9 @@ jobs:
         working-directory: swift
         run: xcodebuild test -scheme IDKit -destination "platform=macOS"
 
+      - name: Build Swift sample app
+        run: xcodebuild -project swift/Examples/IDKitSampleApp/IDKitSampleApp.xcodeproj -scheme IDKitSampleApp -sdk iphoneos CODE_SIGNING_ALLOWED=NO build
+
       - name: Cache Swift .build
         if: steps.restore-swift-build.outputs.cache-hit != 'true'
         uses: actions/cache/save@v4
@@ -208,6 +211,12 @@ jobs:
         with:
           toolchain: stable
 
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "17"
+
       - name: Cache Cargo dependencies
         uses: actions/cache@v4
         with:
@@ -226,3 +235,12 @@ jobs:
 
       - name: Build Kotlin bindings (host + Android ABIs)
         run: ./scripts/build-kotlin.sh
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v4
+        with:
+          packages: tools platform-tools platforms;android-35 build-tools;35.0.0
+
+      - name: Build Kotlin sample app
+        working-directory: kotlin/Examples/IDKitSampleApp
+        run: ./gradlew :app:assembleDebug