add grpc var in runtime_env.sh

Author: ladisgin

docker/building_dependencies/runtime_env.sh

@@ -12,6 +12,7 @@ export C_INCLUDE_PATH=$UTBOT_INSTALL_DIR/lib/clang/10.0.0/include/:$UTBOT_ALL/gt
 export LLVM_INCLUDE_DIRS=$UTBOT_ALL/llvm/llvm
 export CMAKE_CXX_STANDARD=17
 export CMAKE_CXX_STANDARD_REQUIRED=ON
+export GRPC_PATH=$UTBOT_INSTALL_DIR
 export CLI_PATH=$UTBOT_ALL/cli
 export NODE_TLS_REJECT_UNAUTHORIZED=0