Changed Coverage Job to use Golang Image

The coverage job has been changed to use the official CircleCI image
and also the makefile has been updated so that all dependencies
to run coverage are setup. Also added caching of dependencies.

.circleci/config.yml

@@ -11,17 +11,27 @@ jobs:
     steps:
       - checkout
       - run: make release
-  test:
-    machine: true
+  coverage:
+    docker:
+      - image: circleci/golang:1.10
+    working_directory: /go/src/github.com/weaveworks/eksctl
     steps:
       - checkout
-      - run: make install-goveralls
-      - run: make coverage
+      - restore_cache:
+          keys:
+            - v1-pkg-cache
+      - run: make setup-coverage
+      - run: make test-with-coverage
+      - save_cache:
+          key: v1-pkg-cache
+          paths:
+            - "/go/pkg"
 
 workflows:
   version: 2
   any-commit:
     jobs:
+      - coverage
       - make-eksctl-image:
           filters:
             tags:

Makefile

@@ -10,14 +10,17 @@ build:
 
 .PHONY: test
 test:
-	go test -v -covermode=count -coverprofile=coverage.out ./pkg/... ./cmd/...
+	go test -v ./pkg/... ./cmd/...
 
-.PHONY: coverage
-coverage: test
-	goveralls -coverprofile=coverage.out -service=circle-ci -repotoken $(COVERALLS_TOKEN)
+.PHONY: test-with-coverage
+test-with-coverage:
+	go test -v -covermode=count -coverprofile=coverage.out ./pkg/... ./cmd/...
+	goveralls -coverprofile=coverage.out -service=circle-ci
 
-.PHONY: install-goveralls
-install-goveralls:
+.PHONY: setup-coverage
+setup-coverage:
+	curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
+	dep ensure
 	go get github.com/mattn/goveralls
 
 .PHONY: update-bindata