Add XGBoost to merlin-models CPU tests (#131)

Co-authored-by: Adam Laiacano <[email protected]>
Co-authored-by: Oliver Holworthy <[email protected]>

tox.ini

@@ -60,7 +60,7 @@ commands =
     ; the GIT_COMMIT env is the current commit of the core repo
     ; NOTE!!!! We must clean this up in the jenkins configuration with `rm -rf "nvtabular-$GIT_COMMIT"`
     git clone --depth 1 https://github.com/NVIDIA-Merlin/models.git models-{env:GIT_COMMIT}
-    python -m pip install --upgrade ./models-{env:GIT_COMMIT}[dev,implicit,lightfm,tensorflow,torch]
+    python -m pip install --upgrade ./models-{env:GIT_COMMIT}[dev,implicit,lightfm,tensorflow,torch,xgboost]
     python -m pip install --upgrade git+https://github.com/NVIDIA-Merlin/NVTabular.git
     python -m pip install tensorflow==2.9.2
     python -m pip install .