fix(build): terminate program if docker build fails

pkg/docker/build.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"os"
 	"os/exec"
@@ -108,7 +109,7 @@ func printBuildLogs(dst io.Writer, rd io.Reader) error {
 	scanner := bufio.NewScanner(rd)
 	for scanner.Scan() {
 		lastLine = scanner.Text()
-		io.Copy(dst, rd)
+		fmt.Fprintln(dst, lastLine)
 	}
 
 	errLine := &ErrorLine{}

pkg/process/step.go

@@ -17,31 +17,38 @@ func handleSignal() {
 	go func() {
 		for sig := range c {
 			fmt.Println("Stopped process: " + sig.String())
-			if logSpinner.Enabled() {
-				logSpinner.Stop()
-			}
+			terminateSpinner()
 			os.Exit(1)
 		}
 	}()
 }
 
+func terminateSpinner() {
+	if logSpinner.Enabled() {
+		logSpinner.Stop()
+	}
+}
+
 func start(step *api.Step, status *api.StepStatus, lc api.LaunchConfig) error {
 
 	go handleSignal()
 	status.Step = *step
 
 	baseStep, err := step.GetBaseStep(lc)
 	if err != nil {
+		terminateSpinner()
 		return err
 	}
 
 	if err := build(step, baseStep, status, lc); err != nil {
 		status.Phase = api.StepPhaseFailed
+		terminateSpinner()
 		return err
 	}
 	if step.Push && len(step.Platforms) == 0 {
 		if err := push(step, status, lc); err != nil {
 			status.Phase = api.StepPhaseFailed
+			terminateSpinner()
 			return err
 		}
 	}