[ci] Workaround nightly C++ test crash

Author: feisuzhu

.github/workflows/scripts/unix_test.sh

@@ -11,6 +11,7 @@ export TI_IN_DOCKER=$(check_in_docker)
 export LD_LIBRARY_PATH=$PWD/build/:$LD_LIBRARY_PATH
 export TI_OFFLINE_CACHE_FILE_PATH=$PWD/.cache/taichi
 
+
 if [[ "$TI_IN_DOCKER" == "true" ]]; then
     source $HOME/miniconda/etc/profile.d/conda.sh
     conda activate "$PY"
@@ -61,6 +62,10 @@ fi
 
 
 if [ -z "$TI_SKIP_CPP_TESTS" ]; then
+    if [[ "$OSTYPE" == "linux-"* -a "$TI_IN_DOCKER" == "true" ]]; then
+        # Remove mesa EGL driver, which interferes with the propritary NVIDIA drivers
+        rm -f /usr/lib/x86_64-linux-gnu/libEGL_mesa*
+    fi
     python3 tests/run_tests.py --cpp
 fi