[CI] Don't fetch PyTorch for building vLLM upstream (#39)

This PR shortens the CI execution time significantly by using
preinstalled PyTorch during vLLM build.

---------

Signed-off-by: Konrad Zawora <[email protected]>

Author: kzawora-intel

.github/workflows/hourly-ci.yaml

@@ -94,7 +94,8 @@ jobs:
           ENV PT_HPU_ENABLE_LAZY_COLLECTIVES=true
 
           # Ensure setup.py install works as expected
-          RUN VLLM_TARGET_DEVICE=empty pip install .
+          RUN bash -c 'pip install -r <(sed "/^[torch]/d" requirements/build.txt)'
+          RUN VLLM_TARGET_DEVICE=empty pip install --no-build-isolation .
 
           # install development dependencies (for testing)
           RUN python3 -m pip install -e tests/vllm_test_utils

.github/workflows/pre-merge.yaml

@@ -53,7 +53,8 @@ jobs:
           ENV PT_HPU_ENABLE_LAZY_COLLECTIVES=true
 
           # Ensure setup.py install works as expected
-          RUN VLLM_TARGET_DEVICE=empty pip install .
+          RUN bash -c 'pip install -r <(sed "/^[torch]/d" requirements/build.txt)'
+          RUN VLLM_TARGET_DEVICE=empty pip install --no-build-isolation .
 
           # install development dependencies (for testing)
           RUN python3 -m pip install -e tests/vllm_test_utils