Build all artifacts from packlist

Summary:
Instead of hardcoding the targets, it will now build all specified
types in the "packlist".

Reviewed By: jknoxville

Differential Revision: D21349762

fbshipit-source-id: 58f4a3bbf0b6ff4dd87eb44bbd7b200127da8017

packer/src/types.rs

@@ -6,6 +6,7 @@
  */
 
 use clap::arg_enum;
+use std::fmt::{self, Display};
 
 arg_enum! {
     #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, serde::Deserialize)]
@@ -23,3 +24,13 @@ pub enum PackType {
     Frameworks,
     Core,
 }
+
+impl Display for PackType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use PackType::*;
+        match *self {
+            Frameworks => write!(f, "frameworks"),
+            Core => write!(f, "core"),
+        }
+    }
+}