Add Android buildstep

Merged Sébastiaan Versteeg requested to merge android-react-build into master

Since Buddybuild stopped supporting Android and we haven't found any other option. Using a Docker image with all dependencies pre-installed works fine, as you can see. We could add support for uploading to Google Play, however this has no priority. Buddybuild can keep doing the iOS builds just fine.

Edited by Sébastiaan Versteeg

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