container: finance: fetch: prices: format non-alpha currencies

Formats non-alpha character currencies for hledger's prices journal
(e.g., "1INCH", "USDC.e", etc.)

container/src/finance/lib/internal/fetch/prices/internal/base.php

@@ -292,6 +292,11 @@ namespace docker_finance\prices\internal
             $stack = [];  // Final journal entries
             $average = 0;  // Purely for printing
 
+            # Format non-alpha character currencies for hledger (e.g., "1INCH", "USDC.e", etc.)
+            if (!ctype_alpha($ticker)) {
+                $ticker = "\"".$ticker."\"";
+            }
+
             foreach ($prices as $date => $price) {
 
                 // Price journal entry line