chore: bootstrap independent git workflow

Co-Authored-By: Paperclip <noreply@paperclip.ing>

examples/scripts/bootstrap-postgres.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+COMPOSE_FILE="${COMPOSE_FILE:-$ROOT_DIR/docker-compose.demo.yml}"
+SERVICE_NAME="${POSTGRES_SERVICE_NAME:-postgres}"
+POSTGRES_USER="${POSTGRES_USER:-dbtool}"
+POSTGRES_DB="${POSTGRES_DB:-dbtool_demo}"
+
+docker compose -f "$COMPOSE_FILE" exec -T "$SERVICE_NAME" \
+  psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -d "$POSTGRES_DB" \
+  < "$ROOT_DIR/examples/fixtures/postgres/init.sql"
+
+echo "PostgreSQL demo data seeded into $POSTGRES_DB."