Add a `--add-dir` CLI flag so sessions can use extra writable roots in addition to the ones specified in the config file. These are ephemerally added during the session only. Fixes #3303 Fixes #2797
Add a `--add-dir` CLI flag so sessions can use extra writable roots in addition to the ones specified in the config file. These are ephemerally added during the session only. Fixes #3303 Fixes #2797