Build all binaries only on releases deploy

.travis.yml

@@ -23,8 +23,6 @@ install:
 - rsync -r ./vendor/ $GOPATH/src
 script:
 - ./.scripts/test_all.sh
-before_deploy:
-- ./.scripts/build_all.sh
 deploy:
 - provider: releases
   api_key:
@@ -36,6 +34,7 @@ deploy:
     tags: true
     go: 1.7
     repo: tus/tusd
+    condition: $(./.scripts/build_all.sh)
 - provider: script
   script: .scripts/deploy_current.sh
   on: