Fix an issue where warnings aren't displayed correctly (#136)

This is a byte array that needs to be string'd.

CHANGELOG.md

@@ -5,6 +5,7 @@
 - Upgraded buildkit from 0.13.0 to 0.14.1.
 - Upgraded buildx from 0.13.1. to 0.15.1.
 - Upgraded docker from 26.0.0-rc1 to 27.0.1.
+- Fixed an issue where warnings were not displayed correctly.
 
 ## 0.0.3 (2024-05-31)
 

provider/internal/client.go

@@ -128,7 +128,7 @@ func (c *cli) Build(
 		_ = printer.Wait()
 		for _, w := range printer.Warnings() {
 			b := &bytes.Buffer{}
-			fmt.Fprint(b, w.Short)
+			fmt.Fprint(b, fmt.Sprint(w.Short))
 			for _, d := range w.Detail {
 				fmt.Fprintf(b, "\n%s", d)
 			}