Fix Android SDK discovery on self-hosted runner

Author: zzzhr1990

.github/workflows/ffmpeg-dependencies.yml

@@ -32,10 +32,24 @@ jobs:
       - name: Initialize pinned vcpkg
         run: git submodule update --init ffmpeg/vcpkg
 
-      - name: Install Android NDK r29
+      - name: Locate Android NDK r29
         run: |
-          sdkmanager "ndk;29.0.14206865"
-          echo "ANDROID_NDK_HOME=$ANDROID_SDK_ROOT/ndk/29.0.14206865" >> "$GITHUB_ENV"
+          sdk_root="${ANDROID_SDK_ROOT:-${ANDROID_HOME:-$HOME/Library/Android/sdk}}"
+          ndk_root="$sdk_root/ndk/29.0.14206865"
+
+          if [[ ! -f "$ndk_root/build/cmake/android.toolchain.cmake" ]]; then
+            sdkmanager="$sdk_root/cmdline-tools/latest/bin/sdkmanager"
+            if [[ ! -x "$sdkmanager" ]]; then
+              echo "::error::Android SDK Command-line Tools are not installed: $sdkmanager"
+              exit 1
+            fi
+            "$sdkmanager" --sdk_root="$sdk_root" "ndk;29.0.14206865"
+          fi
+
+          test -f "$ndk_root/build/cmake/android.toolchain.cmake"
+          echo "ANDROID_HOME=$sdk_root" >> "$GITHUB_ENV"
+          echo "ANDROID_SDK_ROOT=$sdk_root" >> "$GITHUB_ENV"
+          echo "ANDROID_NDK_HOME=$ndk_root" >> "$GITHUB_ENV"
 
       - name: Restore vcpkg binary cache
         uses: actions/cache@v4