Support build args in tools/maven/api.sh

You may want to pass arguments to the bazel build command line when
publishing, perhaps to debug output, or perhaps to add standalone flags
to avoid sandboxing on platforms where it is broken.

Change-Id: Ia1a9a50e7b833eea7299d9473dec87e4978b7803

tools/maven/api.sh

@@ -16,9 +16,9 @@
 
 set -e
 
-if [[ "$#" != "1" ]] ; then
+if [[ "$#" -lt "1" ]] ; then
   cat <<EOF
-Usage: run "$0 COMMAND" from the top of your workspace,
+Usage: run "$0 COMMAND [build_args...]" from the top of your workspace,
 where COMMAND is one of
 
   install
@@ -54,12 +54,13 @@ war_deploy)
     exit 1
     ;;
 esac
+shift
 
 if [[ "${VERBOSE:-x}" != "x" ]]; then
   set -o xtrace
 fi
 
-bazel build //tools/maven:gen_${command} || \
+bazel build //tools/maven:gen_${command} "$@" || \
   { echo "bazel failed to build gen_${command}. Use VERBOSE=1 for more info" ; exit 1 ; }
 
 ./bazel-genfiles/tools/maven/${command}.sh