build: darwin compatible build env.

.circleci/config.yml

@@ -127,7 +127,7 @@ jobs:
 
   build-all:
     docker:
-     - image: grafana/build-container:1.2.0
+     - image: grafana/build-container:1.2.1
     working_directory: /go/src/github.com/grafana/grafana
     steps:
       - checkout
@@ -175,7 +175,7 @@ jobs:
 
   build:
     docker:
-     - image: grafana/build-container:1.2.0
+     - image: grafana/build-container:1.2.1
     working_directory: /go/src/github.com/grafana/grafana
     steps:
       - checkout
@@ -241,7 +241,7 @@ jobs:
 
   build-enterprise:
     docker:
-     - image: grafana/build-container:1.2.0
+     - image: grafana/build-container:1.2.1
     working_directory: /go/src/github.com/grafana/grafana
     steps:
       - checkout
@@ -273,7 +273,7 @@ jobs:
 
   build-all-enterprise:
     docker:
-    - image: grafana/build-container:1.2.0
+    - image: grafana/build-container:1.2.1
     working_directory: /go/src/github.com/grafana/grafana
     steps:
     - checkout