Official Android Docker for react native (#36)

Provide an official docker to the community and make the ci easier.

Author: gengjiawen

proposals/0003-Official-Docker.md

@@ -0,0 +1,54 @@
+---
+title: Official Android Docker for react native
+author:
+- Daniel Geng
+date: 2018-10-5
+---
+
+# RFC0003: Official Android Docker for react native
+
+## Summary
+
+Provide an official docker to the community and make the ci easier.
+
+## Basic example
+
+Not related.
+
+## Motivation
+
+Docker is a fantastic technology. With this, react native users can easily integrate ci to their code. 
+Also you can easily debug react native code without setting up all the tools needed like android sdk and nodejs.
+Like if you want to build RNTester after you make some change, you can just use something like this:
+```bash
+docker run --rm --name hei -v $PWD:/pwd -w /pwd gengjiawen/react-native /bin/sh -c "./gradlew RNTester:android:app:assembleRelease"
+```
+
+## Detailed design
+
+I have an wip [pr](https://github.com/facebook/react-native/pull/21477), things need to do
+* Fix current docker file
+* Add publish docker script file
+* Hook publish docker script when release a new version
+
+## Drawbacks
+
+Maybe a little cumbersome when update related android tools because now it use a prebuilt docker image.
+But if we build the image in the circle ci, the build time will became longer.
+
+## Alternatives
+ 
+There are many android docker, but most of them lacks node ,ndk or buck(Although I don't use it, but some people do). 
+Also react native developers needn't to find the right docker since we already provide it.
+
+## Adoption strategy
+React Native developers may need to familiar the basics of docker and ci, but this became much easier since
+much more people are using it.
+
+## How we teach this
+
+We should add this to react native website and maybe add it to template and provide an example to demo this.
+
+## Unresolved questions
+
+