fix: use sh not bash (alpine)

bundle.sh

-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 set -euxo pipefail
 

package.json

 {
   "scripts": {
-    "bundle": "bash bundle.sh",
+    "bundle": "sh bundle.sh",
     "lint": "ajv compile --spec=draft2020 -c ajv-formats -s dist/set-payload.schema.json",
     "test": "ajv validate --errors=text --verbose --all-errors -d examples/**/*.json --spec=draft2020 -c ajv-formats -s dist/set-payload.schema.json"
   },
@@ -10,4 +10,4 @@
     "ajv-formats": "^2.1.0"
   },
   "license": "EUPL-1.2"
-}
\ No newline at end of file
+}