Set android sdk correctly

Dockerfile

@@ -21,6 +21,6 @@ RUN android-sdk-linux/tools/bin/sdkmanager \
 
 FROM openjdk:11-jdk
 COPY --from=builder /android-sdk-linux /android-sdk-linux
-ENV ANDROID_HOME=/android-sdk-linux
-ENV PATH=$PATH:/android-sdk-linux/platform-tools/
-ENV GRADLE_OPTS="-Dorg.gradle.daemon=False"
+ENV PATH=$PATH:$ANDROID_HOME/platform-tools/
+ENV ANDROID_SDK_ROOT=$PWD/android-sdk-linux
+ENV GRADLE_OPTS="-Dorg.gradle.daemon=False