make it easier to change php configuration

src/mapping.rs

@@ -161,6 +161,7 @@ pub fn default_mappings<'a>() -> impl IntoIterator<Item = Mapping<'a>> {
             .dont_create(),
         Mapping::new(WorkDir, "xdebug", "/tmp/xdebug"),
         Mapping::new(WorkDir, "profiling", "/tmp/profiling"),
+        Mapping::new(WorkDir, "php.ini", "/php.ini").file(),
     ];
     IntoIterator::into_iter(mappings)
 }