update build.sh

Author: shubha-rajan

.kokoro/build.sh

@@ -33,6 +33,8 @@ export DB_USER="kokoro_ci"
 export DB_PASS=$(cat $KOKORO_GFILE_DIR/secrets-sql-password.txt)
 if [[ $SQL_CLIENT == 'pg' ]]; then
 export CONNECTION_NAME=$(cat $KOKORO_GFILE_DIR/secrets-pg-connection-name.txt)
+elif [[ $SQL_CLIENT == 'sqlserver' ]]; then
+export CONNECTION_NAME=$(cat $KOKORO_GFILE_DIR/secrets-sqlserver-connection-name.txt)
 else
 export CONNECTION_NAME=$(cat $KOKORO_GFILE_DIR/secrets-mysql-connection-name.txt)
 fi