Initial WIP, fails but has the main elements

.dockerignore

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+.git*
+.dockerignore
+Dockerfile
+build
+new-file-header.txt
+CONTRIBUTORS.md
+README.md

Dockerfile

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+FROM debian:9
+# Docker build arguments
+ARG SOURCE_DIR=/repo
+ARG ARTIFACT_DIR=/dist
+ARG ANDROID_DIR=/usr/lib/android-sdk
+# Docker run environment
+ENV SOURCE_DIR=/repo
+ENV ARTIFACT_DIR=/dist
+ENV ANDROID_DIR=/usr/lib/android-sdk
+
+# Prepare Debian build environment
+RUN echo "deb http://deb.debian.org/debian stretch-backports main" >> /etc/apt/sources.list.d/backports.list \
+ && apt-get update \
+ && apt-get install -y mmv wget unzip git \
+ && apt-get install -t stretch-backports -y npm android-sdk openjdk-8-jdk
+
+# Install Android repository tools
+RUN rm -rf ${ANDROID_DIR}/tools \
+ && wget http://dl-ssl.google.com/android/repository/tools_r25.2.3-linux.zip -O tools.zip \
+ && unzip tools.zip -d ${ANDROID_DIR}/ \
+ && rm -f tools.zip
+
+# Install SDK tools
+# `yes` is required to accept licenses:
+# https://stackoverflow.com/questions/38096225/automatically-accept-all-sdk-licences/42125740#42125740
+# There will be a bit of delay (approx 30 seconds)
+RUN yes | ${ANDROID_DIR}/tools/bin/sdkmanager "platform-tools" "platforms;android-27" "build-tools;27.0.3" "extras;android;m2repository" "extras;google;m2repository"
+
+RUN ln -sf ${SOURCE_DIR}/docker-build.sh /docker-build.sh
+
+# Prepare artifact volume
+VOLUME ${ARTIFACT_DIR}/
+
+# Copy repository
+COPY . ${SOURCE_DIR}/
+
+# Set docker-build entrypoint
+ENTRYPOINT ["/docker-build.sh"]

docker-build.sh

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+#!/bin/bash
+
+# Builds the APK inside the Docker container
+
+set -o errexit
+set -o xtrace
+
+# Handle the release type
+case ${RELEASE} in
+    'production')
+        RELEASE_SUFFIX=""
+        NODE_ENV="production"
+        RFLAG="--release"
+    ;;
+    'unminified')
+        RELEASE_SUFFIX="unminified_"
+        NODE_ENV="development"
+        RFLAG="--release"
+    ;;
+    'debug')
+        RELEASE_SUFFIX="debug_"
+        NODE_ENV="development"
+        RFLAG=""
+    ;;
+esac
+
+# Export environment variables
+export ANDROID_HOME=${ANDROID_DIR}
+export NODE_ENV
+
+# Move to source directory
+pushd ${SOURCE_DIR}
+
+# Build APK
+which gradle
+gradle --version
+gradle tasks
+gradle assembleDebug
+
+# Move the artifacts out
+mkdir -p ${ARTIFACT_DIR}/apk
+mmv "${SOURCE_DIR}/platforms/android/build/outputs/apk/android-*.apk" "${ARTIFACT_DIR}/apk/jellyfin-android_${RELEASE_SUFFIX}#1.apk"

new-file-header.txt

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+### This header should be used to start new files.
+### It provides an explicit per-file license reference that should be present on all new files.
+### To use this header, delete these lines and the following empty line, modify <filename> to
+### the proper full path, and then add new code following the header and a single empty line.
+
+// <filename>
+// Part of the Jellyfin project (https://jellyfin.media)
+//
+//    All copyright belongs to the Jellyfin contributors; a full list can
+//    be found in the file CONTRIBUTORS.md
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, version 2.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.