Move scripts used by travis jobs under travis folder because when mirroring all scripts folders are excluded

(cherry picked from commit 9a3588220b)

travis/scripts/start-compose.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+export DOCKER_COMPOSE_PATH="${1}"
+
+if [ -z "$DOCKER_COMPOSE_PATH" ] ; then
+  echo "Please provide path to docker-compose.yml: \"${0##*/} /path/to/docker-compose.yml\""
+  exit 1
+fi
+
+echo "Starting AGS stack in ${DOCKER_COMPOSE_PATH}"
+
+# .env files are picked up from project directory correctly on docker-compose 1.23.0+
+docker-compose --file "${DOCKER_COMPOSE_PATH}" --project-directory $(dirname "${DOCKER_COMPOSE_PATH}") up -d
+
+if [ $? -eq 0 ] ; then
+  echo "Docker Compose started ok"
+else
+  echo "Docker Compose failed to start" >&2
+  exit 1
+fi