daemon: remove .snap suffix given to uploaded containers

daemon/api_sideload_n_try.go

@@ -929,7 +929,7 @@ func readForm(reader *multipart.Reader) (_ *Form, apiErr *apiError) {
 // its path. If the path is not empty then a file was written and it's the
 // caller's responsibility to clean it up (even if the error is non-nil).
 func writeToTempFile(reader io.Reader) (path string, err error) {
-	tmpf, err := os.CreateTemp(dirs.SnapBlobDir, dirs.LocalInstallBlobTempPrefix+"*.snap")
+	tmpf, err := os.CreateTemp(dirs.SnapBlobDir, dirs.LocalInstallBlobTempPrefix+"*")
 	if err != nil {
 		return "", fmt.Errorf("cannot create temp file for form data file part: %v", err)
 	}