refs #18029 [finc] addProductionCredits marc driver

module/finc/src/finc/RecordDriver/SolrMarcFincTrait.php

@@ -2463,4 +2463,14 @@ trait SolrMarcFincTrait
         }
         return null;
     }
-}
+
+    /**
+     * Get credits of people involved in production of the item.
+     * Marc 508 |a
+     * @return array
+     */
+    public function getProductionCredits()
+    {
+        return $this->getFieldArray('508', ['a']);
+    }
+}
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