Don't write new line when printing outputs (#3275)

If the output is a binary format, then newlines can mess that up if
directly using the value of the output.

Signed-off-by: Leo Bergnéhr <leo@bergnehr.se>

pkg/porter/outputs.go

@@ -77,7 +77,7 @@ func (p *Porter) ShowBundleOutput(ctx context.Context, opts *OutputShowOptions)
 		return fmt.Errorf("unable to read output '%s' for installation '%s/%s': %w", opts.Output, opts.Namespace, opts.Name, err)
 	}
 
-	fmt.Fprintln(p.Out, output)
+	fmt.Fprint(p.Out, output)
 	return nil
 }