debug: build unsupported platforms with a warning

Signed-off-by: Dan Luhring <[email protected]>

pkg/build/gobuild.go

@@ -1003,6 +1003,7 @@ func (g *gobuild) buildOne(ctx context.Context, refStr string, base v1.Image, pl
 		}
 	}
 	if g.debug && !doesPlatformSupportDebugging(*platform) {
+		log.Printf("image for platform %q will be built without debugging enabled because debugging is not supported for that platform", *platform)
 		return nil, fmt.Errorf("debugging is not supported for %s", platform)
 	}
 
@@ -1116,7 +1117,7 @@ func (g *gobuild) buildOne(ctx context.Context, refStr string, base v1.Image, pl
 	})
 
 	delvePath := "" // path for delve in image
-	if g.debug {
+	if g.debug && doesPlatformSupportDebugging(*platform) {
 		// get delve locally
 		delveBinary, err := getDelve(ctx, *platform)
 		if err != nil {