travis: run balancebot tests as part of CI

.travis.yml

@@ -71,7 +71,7 @@ matrix:
       env: CI_BUILD_TARGET="sitltest-quadplane sitltest-plane"
     - if: type != cron
       compiler: "clang-7"
-      env: CI_BUILD_TARGET="sitltest-rover sitltest-sub""
+      env: CI_BUILD_TARGET="sitltest-rover sitltest-sub sitltest-balancebot"
     - if: type != cron
       compiler: "clang-7"
       env: CI_BUILD_TARGET="sitl""

Tools/scripts/build_ci.sh

@@ -83,6 +83,10 @@ for t in $CI_BUILD_TARGET; do
         run_autotest "Rover" "build.APMrover2" "drive.APMrover2"
         continue
     fi
+    if [ "$t" == "sitltest-balancebot" ]; then
+        run_autotest "BalanceBot" "build.APMrover2" "drive.BalanceBot"
+        continue
+    fi
     if [ "$t" == "sitltest-sub" ]; then
         run_autotest "Sub" "build.ArduSub" "dive.ArduSub"
         continue