chore: add local docker validation workflow

scripts/start-local-docker.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT_DIR"
+
+if [ ! -f deploy/.env.local ]; then
+  cp deploy/.env.local.example deploy/.env.local
+  echo "created deploy/.env.local from deploy/.env.local.example"
+fi
+
+docker build -f Dockerfile.api -t skg-marketing-local-api:latest .
+docker build -f Dockerfile.web -t skg-marketing-local-web:latest --build-arg NEXT_PUBLIC_API_BASE=/api .
+docker compose -f docker-compose.local.yml --env-file deploy/.env.local up -d --no-build "$@"
+
+WEB_PORT="$(grep -E '^LOCAL_WEB_PORT=' deploy/.env.local | tail -1 | cut -d= -f2-)"
+WEB_PORT="${WEB_PORT:-4390}"
+
+echo "local Docker is starting: http://localhost:${WEB_PORT}"
+echo "login: skg / local-skg unless deploy/.env.local overrides it"