Revert "Make JAVA_HOME platform independent"

This reverts commit 70f18be.

README.md

@@ -118,10 +118,9 @@ More information about **storage driver**:
 ```bash
 # build the image
 # set the working directory to the project's root directory first
-# replace `<amd64|arm64>` with your desired platform
-docker build --build-arg PLATFORM=<amd64|arm64> -t android-sdk android-sdk
+docker build -t android-sdk android-sdk
 # or you can also pass specific tool version as you wish (optional, while there is default version)
-docker build --build-arg PLATFORM=<platform_name> --build-arg JDK_VERSION=<jdk_version> --build-arg GRADLE_VERSION=<gradle_version> --build-arg KOTLIN_VERSION=<kotlin_version> --build-arg ANDROID_SDK_VERSION=<android_sdk_version> -t android-sdk android-sdk
+docker build --build-arg JDK_VERSION=<jdk_version> --build-arg GRADLE_VERSION=<gradle_version> --build-arg KOTLIN_VERSION=<kotlin_version> --build-arg ANDROID_SDK_VERSION=<android_sdk_version> -t android-sdk android-sdk
 # or pull the image instead of building on your own
 docker pull thyrlian/android-sdk
 
@@ -172,7 +171,7 @@ It is also possible if you wanna connect to container via SSH.  There are three
   # Put your `id_rsa.pub` under `android-sdk/accredited_keys` directory (as many as you want)
 
   # Build an image, then an `authorized_keys` file will be composed automatically, based on the keys from `android-sdk/accredited_keys` directory
-  docker build --build-arg PLATFORM=<platform_name> -t android-sdk android-sdk
+  docker build -t android-sdk android-sdk
 
   # Run a container
   docker run -d -p 2222:22 -v $(pwd)/sdk:/opt/android-sdk:ro android-sdk

android-sdk/Dockerfile

@@ -10,9 +10,6 @@ FROM ubuntu:22.04
 # ---------------------------------------------------------------------- #
 LABEL maintainer "[email protected]"
 
-# set PLATFORM with available values for building the image: 'amd64' or 'arm64'
-ARG PLATFORM=amd64
-
 # support multiarch: i386 architecture
 # install Java
 # install essential tools
@@ -54,7 +51,7 @@ RUN mkdir -p ${ANDROID_HOME}/cmdline-tools && \
     rm *tools*linux*.zip
 
 # set the environment variables
-ENV JAVA_HOME /usr/lib/jvm/java-${JDK_VERSION}-openjdk-${PLATFORM}
+ENV JAVA_HOME /usr/lib/jvm/java-${JDK_VERSION}-openjdk-amd64
 ENV GRADLE_HOME /opt/gradle
 ENV KOTLIN_HOME /opt/kotlinc
 ENV PATH ${PATH}:${GRADLE_HOME}/bin:${KOTLIN_HOME}/bin:${ANDROID_HOME}/cmdline-tools/latest/bin:${ANDROID_HOME}/cmdline-tools/tools/bin:${ANDROID_HOME}/platform-tools:${ANDROID_HOME}/emulator