add ndk home env (#80)

Signed-off-by: gengjiawen <technicalcute@gmail.com>

.github/workflows/publish.yml

 name: Publish Docker image
 on:
+  push:
+    branches:
+      - master
   release:
     types: [published]
+
 jobs:
   push_to_registry:
     name: Push Docker image to Docker Hub

Dockerfile

@@ -18,6 +18,7 @@ ENV ADB_INSTALL_TIMEOUT=10
 ENV ANDROID_HOME=/opt/android
 ENV ANDROID_SDK_HOME=${ANDROID_HOME}
 ENV ANDROID_NDK=${ANDROID_HOME}/ndk/$NDK_VERSION
+ENV ANDROID_NDK_HOME=${ANDROID_HOME}/ndk/$NDK_VERSION
 
 ENV PATH=${ANDROID_NDK}:${ANDROID_HOME}/cmdline-tools/tools/bin:${ANDROID_HOME}/emulator:${ANDROID_HOME}/platform-tools:${ANDROID_HOME}/tools:${ANDROID_HOME}/tools/bin:/opt/buck/bin/:${PATH}