tools/testbuild.sh: export some variables for NTFC run script

export currently build configuration and path to artifacts
so these can be used by NTFC run script

Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>

tools/testbuild.sh

@@ -495,6 +495,8 @@ function run {
     run_script="$path/run"
     if [ -x $run_script ]; then
       echo "  Running NuttX..."
+      export ARTIFACTCONFDIR=$ARTIFACTDIR/$(echo $config | sed "s/:/\//")/
+      export CURRENTCONFDIR=$(realpath $path)
       if ! $run_script; then
         fail=1
       fi