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/trust_test.go

@@ -0,0 +1,60 @@
+package container
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEncodedEnvAuth_ShouldReturnAnErrorIfRepoEnvsAreUnset(t *testing.T) {
+	os.Unsetenv("REPO_USER")
+	os.Unsetenv("REPO_PASS")
+	_, err := EncodedEnvAuth("")
+	assert.Error(t, err)
+}
+func TestEncodedEnvAuth_ShouldReturnAuthHashIfRepoEnvsAreSet(t *testing.T) {
+	expectedHash := "eyJ1c2VybmFtZSI6ImNvbnRhaW5ycnItdXNlciIsInBhc3N3b3JkIjoiY29udGFpbnJyci1wYXNzIn0="
+
+	os.Setenv("REPO_USER", "containrrr-user")
+	os.Setenv("REPO_PASS", "containrrr-pass")
+	config, _ := EncodedEnvAuth("")
+
+	assert.Equal(t, config, expectedHash)
+}
+
+func TestEncodedConfigAuth_ShouldReturnAnErrorIfFileIsNotPresent(t *testing.T) {
+	os.Setenv("DOCKER_CONFIG", "/dev/null/should-fail")
+	_, err := EncodedConfigAuth("")
+	assert.Error(t, err)
+}
+
+/*
+ * TODO:
+ * This part only confirms that it still works in the same way as it did
+ * with the old version of the docker api client sdk. I'd say that
+ * ParseServerAddress likely needs to be elaborated a bit to default to
+ * dockerhub in case no server address was provided.
+ *
+ * ++ @simskij, 2019-04-04
+ */
+
+func TestParseServerAddress_ShouldReturnErrorIfPassedEmptyString(t *testing.T) {
+	_, err := ParseServerAddress("")
+	assert.Error(t, err)
+}
+
+func TestParseServerAddress_ShouldReturnTheRepoNameIfPassedAFullyQualifiedImageName(t *testing.T) {
+	val, _ := ParseServerAddress("github.com/containrrrr/config")
+	assert.Equal(t, val, "github.com")
+}
+
+func TestParseServerAddress_ShouldReturnTheOrganizationPartIfPassedAnImageNameMissingServerName(t *testing.T) {
+	val, _ := ParseServerAddress("containrrr/config")
+	assert.Equal(t, val, "containrrr")
+}
+
+func TestParseServerAddress_ShouldReturnTheServerNameIfPassedAFullyQualifiedImageName(t *testing.T) {
+	val, _ := ParseServerAddress("github.com/containrrrr/config")
+	assert.Equal(t, val, "github.com")
+}