Add openpilot tests

selfdrive/test/scons_build_test.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+SCRIPT_DIR=$(dirname "$0")
+BASEDIR=$(realpath "$SCRIPT_DIR/../../")
+cd $BASEDIR
+
+# tests that our build system's dependencies are configured properly, 
+# needs a machine with lots of cores
+scons --clean
+scons --no-cache --random -j$(nproc)