refactor: simplify key metadata handling in issuer key retrieval

Removes unnecessary key_ids intermediate table and conditional kid assignment loop. Directly assigns kids array to return value, reducing code complexity while maintaining the same functionality. The kids array is now passed through unchanged instead of being conditionally copied element by element.

Author: chrisingenhaag

src/handler.lua

@@ -113,18 +113,14 @@ local function custom_helper_issuer_get_keys(well_known_endpoint, cafile)
     end
 
     local decoded_keys = {}
-    local key_ids = {}
     for i, key in ipairs(keys) do
         decoded_keys[i] = custom_base64_decode(key)
-        if kids then
-            key_ids[i] = kids[i]
-        end
     end
 
     kong.log.debug('Number of keys retrieved: ' .. table.getn(decoded_keys))
     return {
         keys = decoded_keys,
-        kids = key_ids,
+        kids = kids,
         key_metadata = key_metadata,
         updated_at = socket.gettime()
     }