Renew yarn keys before apt-get update to avoid errors

Summary:
Yarn key had expired on 2nd of February. The owner has renewed it, but seems like Circle CI still has the old one cached. (see yarnpkg/yarn#6865 (comment))

Changelog: [Internal]

Reviewed By: fkgozali

Differential Revision: D26276386

fbshipit-source-id: 093c7de94445b6ff9beb5792b16564e5c3bd1234

.circleci/config.yml

@@ -502,6 +502,10 @@ jobs:
 
       # Keep configuring Android dependencies while AVD boots up
 
+      # Temp - redownload expired yarn key before apt-get
+      - run:
+          name: Setup yarn key
+          command: curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
       - run:
           name: Install rsync, zip
           command: apt-get update -y && apt-get install rsync zip -y