Allow indexing SP images on name instead of board

Currently, we expect each SP image in the TUF repo to have a
unique board name. This prevents us from also packaging other
images for use in manufacturing. Relax this slightly by requiring
all SP images to have a unique `name` instead of a unique `board`.
We will still select by `board` via wicketd meaning the actual
runtime behavior should still be the same.

update-common/src/artifacts/update_plan.rs

@@ -276,8 +276,14 @@ impl<'a> UpdatePlanBuilder<'a> {
             data.extend_from_slice(&chunk);
         }
 
+        // We purposely read out `name` instead of `board` here to
+        // allow for packaging multiple images for the same board
+        // in the TUF repo (specifically the manufacturing images)
+        // We will still select the image in wicketd via `board`
+        // as the only images we want to install via wicket are those
+        // with name == board.
         let (artifact_id, board) =
-            read_hubris_board_from_archive(artifact_id, data.clone())?;
+            read_hubris_name_from_archive(artifact_id, data.clone())?;
 
         let slot = match sp_map.entry(board) {
             btree_map::Entry::Vacant(slot) => slot,
@@ -1012,7 +1018,7 @@ fn read_hubris_sign_from_archive(
 
 // This function takes and returns `id` to avoid an unnecessary clone; `id` will
 // be present in either the Ok tuple or the error.
-fn read_hubris_board_from_archive(
+fn read_hubris_name_from_archive(
     id: ArtifactId,
     data: Vec<u8>,
 ) -> Result<(ArtifactId, Board), RepositoryError> {
@@ -1028,7 +1034,7 @@ fn read_hubris_board_from_archive(
             return Err(RepositoryError::ReadHubrisCaboose { id, error });
         }
     };
-    let board = match caboose.board() {
+    let board = match caboose.name() {
         Ok(board) => board,
         Err(error) => {
             return Err(RepositoryError::ReadHubrisCabooseBoard { id, error });

wicketd/src/update_tracker.rs

@@ -943,6 +943,10 @@ impl UpdateDriver {
                         })?
                         .into_inner();
 
+                    // The sp_artifacts were built on the caboose `NAME`
+                    // entry but we intentonally get via the `BORD` entry
+                    // as that represents the only images we want to install
+                    // via wicket
                     let Some(sp_artifact) = sp_artifacts.get(&caboose.board)
                     else {
                         return Err(