Make the released binaries statically linked

Author: bep

circle.yml

@@ -1,10 +1,11 @@
-checkout:
-  post:
-    - git fetch --tags
+dependencies:
+  pre:
+    - sudo apt-get update; sudo apt-get install clang-3.6
 deployment:
   tag:
     tag: /v[0-9]+(\.[0-9]+)*(-.*)*/
     owner: bep
     commands:
       - gem install fpm
+      - export CC="clang-3.6"
       - curl -sL https://git.io/goreleaser | bash

goreleaser.yml

@@ -1,6 +1,7 @@
 build:
   main: main.go
   binary: s3deploy
+  ldflags: -s -w -linkmode external -extldflags "-static"
   goos:
     - darwin
     - linux