feat: Add bootstrap support for skyline image

When docker run, specify the KOLLA_BOOSTRAP environment variable, the
skyline image will initialize the database, and if it is not specified,
the skyline service will be run in the normal way.
This provides the basis for subsequent docking with kolla-ansible.

Change-Id: I5eaad038b3ed3c3189f2b41e41c14d28a346ee88

container/start_service.sh

@@ -7,6 +7,12 @@ echo "/usr/local/bin/gunicorn -c /etc/skyline/gunicorn.py skyline_apiserver.main
 mapfile -t CMD < <(tail /run_command | xargs -n 1)
 
 # kolla_extend_start
+if [[ "${!KOLLA_BOOTSTRAP[*]}" ]]; then
+    cd /skyline/libs/skyline-apiserver/
+    make db_sync
+    exit 0
+fi
+
 nginx-generator -o /etc/nginx/nginx.conf
 nginx