init: UserBaseService (backend + deploy + scripts)

deploy/find_db.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -e
+echo "== all containers (name + image) =="
+docker ps -a --format '{{.Names}}\t{{.Image}}'
+echo "== which containers are on infra-infra-net =="
+docker network inspect infra-infra-net --format '{{range .Containers}}{{.Name}} ({{.IPv4Address}}){{"\n"}}{{end}}' 2>/dev/null || echo "no such network"
+echo "== resolve mysql8 from userbase-app =="
+docker exec userbase-app getent hosts mysql8 2>/dev/null || echo "getent failed"