Setup a working pipeline

* add tests to ensure function even after switching docker client api version
* switch docker client api version to remove import of Sirupsen and get rid of the casing workaround
* migrate from glide to dep to go modules
* rewrite ci workflow
  * only run publish on version tags
  * only run build on branches
  * update goreleaser config
  * disable automated latest tag push
* remove dependency to v2tec/docker-gobuilder
* remove dead code and files
* add golands .idea folder to gitignore
* add label to released docker images
* add test reporting, add some unit tests
* change test output dir
* fix goreleaser versions
* add debug output for circleci and goreleaser
* disable cgo

container/container_test.go

@@ -0,0 +1,25 @@
+package container
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestContainsWatchtowerLabel_ShouldReturnTrueIfTheWatchtowerLabelExistsOnTheContainer(t *testing.T) {
+	labelMap := map[string]string {
+		"com.centurylinklabs.watchtower": "true",
+	}
+	assert.True(t, ContainsWatchtowerLabel(labelMap))
+}
+
+func TestContainsWatchtowerLabel_ShouldReturnFalseIfTheWatchtowerLabelDoesntExistOnTheContainer(t *testing.T) {
+	labelMap := map[string]string {
+		"com.containrrr.watchtower": "lost",
+	}
+	assert.False(t, ContainsWatchtowerLabel(labelMap))
+}
+
+func TestContainsWatchtowerLabel_ShouldReturnFalseIfLabelsIsEmpty(t *testing.T) {
+	labelMap := map[string]string {}
+	assert.False(t, ContainsWatchtowerLabel(labelMap))
+}