Set up automatic release publishing (#266)

Summary:
On tags, build and publish artifacts to bintray. The encrypted accounted creds are for a `flipperfbbot` account on Bintray I created for this.
Pull Request resolved: https://github.com/facebook/flipper/pull/266

Reviewed By: priteshrnandgaonkar

Differential Revision: D9848181

Pulled By: passy

fbshipit-source-id: cf9150b2352a9ce972c48533ce15e8e75aa908fe

.circleci/config.yml

@@ -11,8 +11,22 @@ jobs:
             ./gradlew :sample:assembleDebug
             scripts/publish-android-snapshot.sh
 
+  release:
+    docker:
+      - image: circleci/android:api-28-ndk-r17b
+    steps:
+      - checkout
+      - run:
+          name: build and deploy
+          command: scripts/publish-android-release.sh
+
 workflows:
   version: 2
   build:
     jobs:
       - build
+      - release:
+          filters:
+            tags:
+              - only: /^v.*/
+