Renamed zot-exporter to zxp and added its image to zot release

Signed-off-by: Alexei Dodon <adodon@cisco.com>

cmd/zxp/main.go

@@ -0,0 +1,16 @@
+//go:build minimal
+// +build minimal
+
+package main
+
+import (
+	"os"
+
+	"zotregistry.io/zot/pkg/exporter/cli"
+)
+
+func main() {
+	if err := cli.NewExporterCmd().Execute(); err != nil {
+		os.Exit(1)
+	}
+}