Tools: also test out directory working in one of the build tests

Tools/scripts/build_ci.sh

@@ -170,9 +170,17 @@ for t in $CI_BUILD_TARGET; do
 
     if [ "$t" == "revo-bootloader" ]; then
         echo "Building revo bootloader"
-        $waf configure --board revo-mini --bootloader
+        if [ -f ~/alternate_build/revo-mini/bin/AP_Bootloader.bin ]; then
+            rm -r ~/alternate_build
+        fi
+        $waf configure --board revo-mini --bootloader --out ~/alternate_build
         $waf clean
         $waf bootloader
+        # check if bootloader got built under alternate_build
+        if [ ! -f ~/alternate_build/revo-mini/bin/AP_Bootloader.bin ]; then
+            echo "alternate build output directory Test failed"
+            exit 1
+        fi
         continue
     fi