add titan secrets

Author: casteryh

.github/workflows/unit_test.yaml

@@ -44,6 +44,8 @@ jobs:
       - name: Install torchtitan
         run: |
           source .github/workflows/activate_conda_env.sh
+          eval "$(ssh-agent -s)"
+          ssh-add - <<< '${{ secrets.FORGE_GITHUB_CI_FOR_TORCHTITAN }}'
           python -m pip install git+ssh://[email protected]/pytorch/torchtitan.git
       - name: Install dependencies
         run: |