🔧 Use crane.Insecure while checking image availability

As those checks are not consuming any digest, we just use them to assess
if we need to build or not certain packages. The backend will refuse the
image if not configured appropriately

pkg/api/client/search.go

@@ -36,7 +36,7 @@ func TreePackages(treedir string) (searchResult SearchResult, err error) {
 }
 
 func imageAvailable(image string) bool {
-	_, err := crane.Digest(image)
+	_, err := crane.Digest(image, crane.Insecure)
 	return err == nil
 }