Ensure we fail during deploys

If an error gets emitted during a deployment, we should fail.
This also reenables colors that seems to have gotten lost somewhere.

pkg/engine/deploy.go

@@ -108,7 +108,9 @@ func (eng *Engine) deployLatest(info *envCmdInfo, opts deployOptions) error {
 			_ = eng.Environment.SaveEnvironment(targ, summary.Snap())
 
 			fmt.Fprint(eng.Stdout, colors.Colorize(&footer))
-			return err
+			if err != nil {
+				return err
+			}
 		}
 	}
 	if !eng.Diag().Success() {

pkg/engine/engine.go

@@ -21,7 +21,9 @@ type Engine struct {
 
 func (e *Engine) Diag() diag.Sink {
 	if e.snk == nil {
-		e.InitDiag(diag.FormatOptions{})
+		e.InitDiag(diag.FormatOptions{
+			Colors: true,
+		})
 	}
 
 	return e.snk