Upgrade to Go 1.12 (#630)

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
   validate:
     docker:
-      - image: circleci/golang:1.10
+      - image: circleci/golang:1.12
     working_directory: /go/src/github.com/virtual-kubelet/virtual-kubelet
     steps:
       - checkout
@@ -21,7 +21,7 @@ jobs:
 
   test:
     docker:
-      - image: circleci/golang:1.10
+      - image: circleci/golang:1.12
     working_directory: /go/src/github.com/virtual-kubelet/virtual-kubelet
     steps:
       - checkout
@@ -102,6 +102,11 @@ jobs:
       - run:
           name: Run the end-to-end test suite
           command: |
+            mkdir $HOME/.go
+            export PATH=$HOME/.go/bin:${PATH}
+            curl -fsSL -o "/tmp/go.tar.gz" "https://dl.google.com/go/go1.12.5.linux-amd64.tar.gz"
+            tar -C $HOME/.go --strip-components=1 -xzf "/tmp/go.tar.gz"
+            go version
             make e2e
       - run:
           name: Collect logs on failure from vkubelet-mock-0