Add gitpod config

this commit adds support for Gitpod.io, a free automated
dev environment that makes contributing and generally working on GitHub
projects much easier. It allows anyone to start a ready-to-code dev
environment for any branch, issue and pull request with a single click.

Author: Monster-Gaming-Studios

.gitpod.Dockerfile

@@ -1,10 +1,36 @@
-FROM gitpod/workspace-full
-                    
+FROM gitpod/workspace-full:latest
+
+ENV ANDROID_HOME=/home/gitpod/android-sdk \
+    FLUTTER_HOME=/home/gitpod/flutter
+
+USER root
+
+RUN curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
+    curl https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list && \
+    apt-get update && \
+    apt-get -y install build-essential dart libkrb5-dev gcc make gradle android-tools-adb android-tools-fastboot openjdk-8-jdk && \
+    apt-get clean && \
+    apt-get -y autoremove && \
+    apt-get -y clean && \
+    rm -rf /var/lib/apt/lists/*;
+
 USER gitpod
 
-# Install custom tools, runtime, etc. using apt-get
-# For example, the command below would install "bastet" - a command line tetris clone:
-#
-# RUN sudo apt-get -q update && #     sudo apt-get install -yq bastet && #     sudo rm -rf /var/lib/apt/lists/*
-#
-# More information: https://www.gitpod.io/docs/config-docker/
+RUN cd /home/gitpod && \
+    wget -qO flutter_sdk.tar.xz \
+    https://storage.googleapis.com/flutter_infra/releases/stable/linux/flutter_linux_v1.9.1+hotfix.4-stable.tar.xz &&\
+    tar -xvf flutter_sdk.tar.xz && \
+    rm -f flutter_sdk.tar.xz
+
+RUN cd /home/gitpod && \
+    wget -qO android_studio.zip \
+    https://dl.google.com/dl/android/studio/ide-zips/3.3.0.20/android-studio-ide-182.5199772-linux.zip && \
+    unzip android_studio.zip && \
+    rm -f android_studio.zip
+
+# TODO(tianhaoz95): make the name of the SDK file into an environment variable to avoid maintainance issue
+RUN mkdir -p /home/gitpod/android-sdk && \
+    cd /home/gitpod/android-sdk && \
+    wget https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip && \
+    unzip sdk-tools-linux-4333796.zip && \
+    rm -f sdk-tools-linux-4333796.zip

.gitpod.yml

@@ -1,6 +1,21 @@
-tasks:
-  - init: echo "Replace me with a build script for the project."
-    command: echo "Replace me with something that should run on every start, or just
-      remove me entirely."
 image:
-  file: .gitpod.Dockerfile
+  file: .gitpod.dockerfile
+github:
+  prebuilds:
+    master: true
+    branches: false
+    pullRequests: true
+    pullRequestsFromForks: false
+    addCheck: false
+    addComment: true
+    addBadge: false
+    addLabel: false
+tasks:
+- command: |
+    mkdir -p /home/gitpod/.android
+    touch /home/gitpod/.android/repositories.cfg
+    export PATH=/usr/lib/dart/bin:$FLUTTER_HOME/bin:$ANDROID_HOME/bin:$PATH
+    /home/gitpod/android-sdk/tools/bin/sdkmanager "platform-tools" "platforms;android-28" "build-tools;28.0.3"
+vscode:
+  extensions:
+    - [email protected]:/kOacEWdiDRLyN/idUiM4A==