[build] adding docker images

platform/android/docker/README.md

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+
+```
+docker build -t maptiler/android-base -f android-base .
+docker build -t maptiler/android-ndk-r21b -f android-ndk-r21b .
+```

platform/android/docker/android-base

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+FROM ubuntu:xenial-20181005
+ENV DEBIAN_FRONTEND="noninteractive"
+
+# Add base filesystems
+ADD filesystem/libsysconfcpus.tar.gz \
+    filesystem/apt-google-cloud-sdk.tar.gz \
+    /
+
+# libsysconfcpus.so can be used to alter the number of CPUs reported by the system
+ENV LD_PRELOAD=/usr/lib/libsysconfcpus.so
+
+# Add apt keys
+RUN set -eu \
+ && (find /tmp/*.gpg | xargs -n1 apt-key add) \
+ && rm /tmp/*.gpg
+
+# Install base packages
+RUN set -eu \
+ && apt-get update \ 
+ && apt-get -y install software-properties-common \
+ && apt-get update \ 
+ && add-apt-repository -y ppa:git-core/ppa \
+ && apt-get update \
+ && apt-get -y install git curl make python3 python3-pip zip unzip ccache openjdk-8-jdk-headless apt-transport-https \
+ && update-alternatives --install /usr/bin/python python /usr/bin/python3 1 \
+ && rm -rf /var/lib/apt/lists/*
+
+# Install CLI tools for CI scripting
+RUN set -eu \
+ && apt-key adv --keyserver keyserver.ubuntu.com --recv-key C99B11DEB97541F0 \
+ && apt-add-repository https://cli.github.com/packages \
+ && apt-get update \
+ && apt-get -y install jq gh \
+ && rm -rf /var/lib/apt/lists/*
+
+# Install Google Cloud SDK
+RUN set -eu \
+ && apt-get update \
+ && apt-get -y install google-cloud-sdk \
+ && rm -rf /var/lib/apt/lists/*
+
+# Install awscli
+RUN set -eu \
+ && pip3 install awscli
+
+# Install Node.js
+# Check https://nodejs.org/en/download/releases/ for releases
+ENV NVM_DIR="/root/.nvm" \
+    PATH="/root/.nvm/versions/node/v10.13.0/bin:$PATH"
+RUN set -e \
+ && git -c advice.detachedHead=false clone https://github.com/creationix/nvm.git -b v0.33.11 --depth=1 "$NVM_DIR" \
+ && . "$NVM_DIR/nvm.sh" \
+ && nvm install v10.13.0
+
+ENV ANDROID_NDK_HOME=/android/sdk/ndk-bundle \
+    ANDROID_HOME=/android/sdk \
+    GRADLE_OPTS=-Dorg.gradle.daemon=false

platform/android/docker/android-ndk-r21b

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+FROM ghcr.io/maptiler/android-base
+
+WORKDIR /android/sdk
+
+# Install Android SDK
+# Use most recent version from https://developer.android.com/studio/index.html#command-tools
+# and update the checksum.
+RUN set -eu \
+ && curl -L --retry 3 https://dl.google.com/android/repository/commandlinetools-linux-6200805_latest.zip -o tools.zip \
+ && (echo "f10f9d5bca53cc27e2d210be2cbc7c0f1ee906ad9b868748d74d62e10f2c8275  tools.zip" | sha256sum -c) \
+ && unzip -q tools.zip && rm tools.zip
+
+# Install Android NDK
+# Use desired version from https://developer.android.com/ndk/downloads/index.html
+# and update the checksum.
+RUN set -eu \
+ && curl -L --retry 3 https://dl.google.com/android/repository/android-ndk-r21-linux-x86_64.zip -o ndk.zip \
+ && (echo "afc9c0b9faad222898ac8168c78ad4ccac8a1b5c  ndk.zip" | sha1sum -c) \
+ && unzip -q ndk.zip && rm ndk.zip && mv android-ndk-r* ndk-bundle
+
+# Install dependencies and build tools
+
+RUN set -eu \
+ && mkdir -p "${ANDROID_HOME}/licenses" \
+ && echo "24333f8a63b6825ea9c5514f83c2829b004d1fee" > "${ANDROID_HOME}/licenses/android-sdk-license" \
+ && tools/bin/sdkmanager \
+        "--sdk_root=${ANDROID_HOME}" \ 
+        "platform-tools" \
+        "platforms;android-29" \
+        "build-tools;29.0.2" \
+        "build-tools;29.0.3" \
+        "platforms;android-28" \
+        "build-tools;28.0.3" \
+        "extras;android;m2repository" \
+        "patcher;v4" \
+        "extras;google;m2repository" \
+        "extras;m2repository;com;android;support;constraint;constraint-layout;1.0.2" \
+        "cmake;3.10.2.4988404" \
+ && rm -rf "${ANDROID_HOME}/licenses"
+
+WORKDIR /src

platform/android/docker/filesystem/etc/apt/sources.list.d/google-cloud-sdk.list

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+deb http://packages.cloud.google.com/apt cloud-sdk-xenial main

platform/android/docker/filesystem/etc/apt/sources.list.d/llvm.list

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+deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-7 main
+deb-src http://apt.llvm.org/xenial/ llvm-toolchain-xenial-7 main

platform/android/docker/filesystem/etc/apt/sources.list.d/toolchain.list

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+deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
+deb-src http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main