Ignore errors while attempting to perist the cache.

They are likely to be permission issues or rare race
conditions caused by multiple processes using the same
cache.

In such instance it's better to simply gracefully degrade
to not peristing the cache.

ext/bootsnap/bootsnap.c

@@ -763,9 +763,11 @@ bs_fetch(char * path, VALUE path_v, char * cache_path, VALUE handler, VALUE args
   /* If storage_data isn't a string, we can't cache it */
   if (!RB_TYPE_P(storage_data, T_STRING)) goto invalid_type_storage_data;
 
-  /* Write the cache key and storage_data to the cache directory */
-  res = atomic_write_cache_file(cache_path, &current_key, storage_data, &errno_provenance);
-  if (res < 0) goto fail_errno;
+  /* Attempt to write the cache key and storage_data to the cache directory.
+   * We do however ignore any failures to persist the cache, as it's better
+   * to move along, than to interrupt the process.
+   */
+  atomic_write_cache_file(cache_path, &current_key, storage_data, &errno_provenance);
 
   /* Having written the cache, now convert storage_data to output_data */
   exception_tag = bs_storage_to_output(handler, args, storage_data, &output_data);