[rocm-libraries] ROCm/rocm-libraries#4352 (commit 3c9beb3)

[CK] MICI: Fix git diff in selective_test_filter.py

## Motivation

- git diff needs access to reference repo

## Technical Details

- mount reference repo path into docker for selective_test_filter.py to
access

## Test Plan

- tested in MICI

## Test Result

- launch_tests.sh ran successfully