Docker Build Specs for Flutter SDK (Android Platform Only)

flutter.Dockerfile

FROM openjdk:8-slim
LABEL maintainer "Kristopher Lam <kris@sandb0x.io>"

ENV SDK_TOOLS_REV="4333796" \
    ANDROID_HOME="/opt/android-sdk" \
    ANDROID_COMPILE_SDK="28" \
    ANDROID_BUILD_TOOLS_VERSION="28.0.2" \
    FLUTTER_HOME="/opt/flutter" \
    PATH="${PATH}:/opt/android-sdk/tools/bin:/opt/android-sdk/platform-tools:/opt/flutter/bin:/opt/flutter/bin/cache/dart-sdk/bin"
    
WORKDIR /tmp
RUN apt-get -qq update && \
    apt-get install -qqy --no-install-recommends curl tar git unzip lib32stdc++6 lib32z1 && \
    rm -rf /var/lib/apt/lists/* && \
    mkdir -p $ANDROID_HOME && \
    curl https://dl.google.com/android/repository/sdk-tools-linux-${SDK_TOOLS_REV}.zip --silent --output android-sdk.zip && \
    unzip android-sdk.zip -d $ANDROID_HOME && \
    rm android-sdk.zip && \
    echo y | sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" >/dev/null && \
    echo y | sdkmanager "platform-tools" >/dev/null && \
    echo y | sdkmanager "build-tools;${ANDROID_BUILD_TOOLS_VERSION}" >/dev/null && \
    yes | sdkmanager --licenses && \
    git clone --branch stable https://github.com/flutter/flutter.git ${FLUTTER_HOME}
RUN flutter doctor