feat: custom download url, custom repository

dist/utils/getAsset.js

@@ -1,5 +1,5 @@
 import { exit } from '../index.js';
-export default (assets) => {
+export const getArchitecture = () => {
     let arch;
     switch (process.arch) {
         case 'arm64':
@@ -13,6 +13,10 @@ export default (assets) => {
     }
     if (!['linux', 'darwin'].some(platform => process.platform === platform))
         throw new Error(`Unsupported platform ${process.platform}.`);
+    return arch;
+};
+export default (assets) => {
+    const arch = getArchitecture();
     const assetName = `bun-${process.platform}-${arch}.zip`;
     const asset = assets.find(asset => asset.name === assetName);
     if (!asset)