fix(deploy): default the Fly Supabase db image to the :17 tag (#85)

The :17-alpine tag was retired when :17 moved to the Alpine base, so the
default no longer tracked releases. Deployments without CLOUDSYNC_IMAGE now
pull the current released image.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: andinux

deploy/supabase-flyio/docker-compose.cloudsync.yml

@@ -4,7 +4,7 @@ services:
   db:
     # Released tag by default; set CLOUDSYNC_IMAGE (e.g. `fly secrets set`) to
     # run a beta build without touching the repo.
-    image: ${CLOUDSYNC_IMAGE:-sqlitecloud/sqlite-sync-supabase:17-alpine}
+    image: ${CLOUDSYNC_IMAGE:-sqlitecloud/sqlite-sync-supabase:17}
     volumes:
       - ./cloudsync.sql:/docker-entrypoint-initdb.d/init-scripts/100-cloudsync.sql:Z
     ports: