Add local instaswap E2E workspace harness

local-compose.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ENV_FILE="${ROOT_DIR}/.env.local"
+
+if [[ ! -f "${ENV_FILE}" ]]; then
+  if [[ -f "${ROOT_DIR}/.env.local.example" ]]; then
+    cp "${ROOT_DIR}/.env.local.example" "${ENV_FILE}"
+    echo "Created ${ENV_FILE} from .env.local.example" >&2
+  else
+    echo "Missing ${ENV_FILE} and .env.local.example" >&2
+    exit 1
+  fi
+fi
+
+exec env \
+  LOCAL_UID="$(id -u)" \
+  LOCAL_GID="$(id -g)" \
+  docker compose \
+  --env-file "${ENV_FILE}" \
+  -f "${ROOT_DIR}/docker-compose.local.yml" \
+  "$@"