automatically deploy api to prod_build when merged to production

circle.yml

@@ -16,3 +16,8 @@ deployment:
       - git clone git@github.com:mapzen/pelias-deploy.git && cd pelias-deploy && bundle install
       - cd pelias-deploy && bundle exec rake deploy:api[dev]
       - cd acceptance-tests && npm test -- -e dev
+  prod_build:
+    branch: production
+    commands:
+      - git clone git@github.com:mapzen/pelias-deploy.git && cd pelias-deploy && bundle install
+      - cd pelias-deploy && bundle exec rake deploy:api[prod_build]