Add Docker image

.drone.yml

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+pipeline:
+  publish:
+    image: plugins/docker
+    registry: registry:5000
+    insecure: true
+    repo: registry:5000/builder-android
+    tags:
+      - latest
+      - "${DRONE_COMMIT_SHA:0:8}"

Dockerfile

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+# Android Dockerfile based on uber/android-build-environment
+
+FROM ubuntu:16.04
+
+# Never ask for confirmations
+ENV DEBIAN_FRONTEND noninteractive
+
+# SDK version
+ENV ANDROID_SDK_VERSION 3859397
+
+# Update apt-get
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+      build-essential \
+      software-properties-common \
+      unzip \
+      wget \
+      zip \
+  && apt-add-repository ppa:openjdk-r/ppa \
+  && apt-get update \
+  && apt-get install -y openjdk-9-jdk \
+  && apt-get autoremove -y \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
+
+# Install Android SDK
+RUN wget https://dl.google.com/android/repository/sdk-tools-linux-$ANDROID_SDK_VERSION.zip \
+  && unzip sdk-tools-linux-$ANDROID_SDK_VERSION.zip \
+  && mv tools /usr/local/android-tools \
+  && rm sdk-tools-linux-$ANDROID_SDK_VERSION.zip
+
+RUN echo y | /usr/local/android-tools/bin/sdkmanager \
+  "platform-tools" \
+  "platforms;android-26" \
+  "build-tools;26.0.2" \
+  \
+  "ndk-bundle" \
+  "lldb;2.3" \
+  "cmake;3.6.4111459"
+
+# Environment variables
+ENV ANDROID_HOME /usr/local/android-tools
+ENV PATH $ANDROID_HOME:$PATH
+ENV PATH $ANDROID_HOME/platform-tools:$PATH
+ENV PATH $ANDROID_HOME/tools:$PATH
+ENV PATH $ANDROID_HOME/bin:$PATH
+
+# Export JAVA_HOME variable
+ENV JAVA_HOME /usr/lib/jvm/java-9-openjdk-amd64/
+
+# Support Gradle
+ENV TERM dumb
+ENV JAVA_OPTS "-Xms512m -Xmx1024m"
+ENV GRADLE_OPTS "-XX:+UseG1GC -XX:MaxGCPauseMillis=1000"
+
+# Add build user account, values are set to default below
+ENV RUN_USER builder
+ENV RUN_UID 5000
+
+RUN id $RUN_USER || adduser --uid "$RUN_UID" \
+    --gecos 'Build User' \
+    --shell '/bin/sh' \
+    --disabled-login \
+    --disabled-password "$RUN_USER"
+
+# Fix permissions
+RUN chown -R $RUN_USER:$RUN_USER $ANDROID_HOME
+RUN chmod -R a+rx $ANDROID_HOME
+
+# Creating project directories prepared for build when running
+# `docker run`
+ENV PROJECT /project
+RUN mkdir $PROJECT
+RUN chown -R $RUN_USER:$RUN_USER $PROJECT
+WORKDIR $PROJECT
+
+USER $RUN_USER
+RUN echo "sdk.dir=$ANDROID_HOME" > local.properties
+
+CMD ["./gradlew", "build"]