Fix Android NDK setup: locate SDK dir dynamically instead of hardcoding path

The doc-recommended ~/.swiftpm/swift-sdks/... path didn't match where
swift sdk install placed the bundle inside the swift:6.3.2 container
(actual HOME differed from what the docs assume). Locate the
swift-android directory with find instead of hardcoding the path.

Author: colemancda

.github/workflows/swift.yml

@@ -83,7 +83,9 @@ jobs:
           run: |
             set -eux
             unset ANDROID_NDK_ROOT
-            cd ~/.swiftpm/swift-sdks/swift-6.3.2-RELEASE_android.artifactbundle/swift-android/
+            sdk_dir="$(find / -maxdepth 8 -type d -path '*swift-6.3.2-RELEASE_android.artifactbundle/swift-android' 2>/dev/null | head -1)"
+            test -n "$sdk_dir"
+            cd "$sdk_dir"
             curl -fSL -o ndk.zip "https://dl.google.com/android/repository/android-ndk-r27d-Linux.zip"
             unzip -qo ndk.zip
             echo "ANDROID_NDK_HOME=$PWD/android-ndk-r27d" >> "$GITHUB_ENV"