mobile: exclude config extra from fingerprint so OTAs match across commits

app.config injects the git hash into extra.gitHash, which @expo/fingerprint hashed into the runtimeVersion, giving every commit a unique fingerprint that no OTA could match. Skip ExpoConfigExtraSection (nothing under extra affects the native binary) so the fingerprint is stable across commits.

Author: aapeliv

app/mobile/fingerprint.config.js

@@ -0,0 +1,13 @@
+// @expo/fingerprint hashes the resolved Expo config, including `extra`. Our
+// app.config.js injects the git commit hash into `extra.gitHash`, so without
+// this skip every commit produced a unique runtimeVersion and an OTA update
+// could never match an already-installed build. Nothing under `extra` (router,
+// eas, gitHash) affects the native binary, so excluding it keeps the fingerprint
+// stable across commits while still rebuilding when real native inputs change.
+// The default package.json script skip is preserved.
+module.exports = {
+  sourceSkips: [
+    "PackageJsonAndroidAndIosScriptsIfNotContainRun",
+    "ExpoConfigExtraSection",
+  ],
+};