[ci][build] add tests for python only compilation (#10915)

Signed-off-by: youkaichao <youkaichao@gmail.com>

tests/standalone_tests/python_only_compile.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+# This script tests if the python only compilation works correctly
+# for users who do not have any compilers installed on their system
+
+set -e
+set -x
+
+cd /vllm-workspace/
+
+# uninstall vllm
+pip3 uninstall -y vllm
+# restore the original files
+mv test_docs/vllm ./vllm
+
+# remove all compilers
+apt remove --purge build-essential -y
+apt autoremove -y
+
+echo 'import os; os.system("touch /tmp/changed.file")' >> vllm/__init__.py
+
+VLLM_USE_PRECOMPILED=1 pip3 install -vvv -e .
+
+# Run the script
+python3 -c 'import vllm'
+
+# Check if the clangd log file was created
+if [ ! -f /tmp/changed.file ]; then
+    echo "changed.file was not created, python only compilation failed"
+    exit 1
+fi