add changelog

Signed-off-by: jason yang <jasonyangshadow@gmail.com>

CHANGELOG.md

@@ -9,6 +9,12 @@ For older changes see the [archived Singularity change log](https://github.com/a
 
 - Label process for starter binary of interactive containers with image filename,
   for example: `Apptainer runtime parent: example.sif`.
+- The `registry login` and `registry logout` commands now support a `--authfile
+  <path>` flag, which causes the OCI credentials to be written to / removed from
+  a custom file located at `<path>` instead of the default location
+  (`$HOME/.singularity/docker-config.json`). The commands `pull`, `push`, `run`,
+  `exec`, `shell`, and `instance start` can now also be passed a `--authfile
+  <path>` option, to read OCI registry credentials from this custom file.
 
 ## Changes for v1.3.x