update

Author: NullPointerException

.github/workflows/build-ffmpeg.yml

@@ -45,6 +45,7 @@ jobs:
           wget https://dl.google.com/android/repository/android-ndk-r22b-linux-x86_64.zip
           unzip android-ndk-r22b-linux-x86_64.zip -d ${ANDROID_SDK_ROOT}/ndk
           echo "ANDROID_NDK_HOME=${ANDROID_SDK_ROOT}/ndk/android-ndk-r22b" >> $GITHUB_ENV
+          export ANDROID_NDK_HOME=${ANDROID_SDK_ROOT}/ndk/android-ndk-r22b
 
       - name: 验证 NDK 配置
         run: |