Run everything with Docker Compose

[phuthuycoding]

What

• compose.yaml: local MongoDB (mongo:7) and MySQL (mysql:8.4) from the official images with the root credentials dbclone expects, plus a dbclone service (compose profile cli, so up -d never starts it) built from the new Dockerfile.
• Dockerfile: multi-stage, static binary on alpine + docker-cli. dbclone only needs the Docker CLI and the socket, because every dump/restore still runs inside the two containers.
• Profiles persist in the dbclone-config volume; logs land in ./logs. Names, ports and the local root password are overridable (DBCLONE_MONGO_CONTAINER, DBCLONE_MYSQL_CONTAINER, DBCLONE_MONGO_PORT, DBCLONE_MYSQL_PORT, DBCLONE_LOCAL_PASSWORD).
• README: "Or run everything with Docker Compose" section.

Verified

On this machine, with overridden names/ports (the default names and ports were already taken):

docker compose run --rm dbclone -check
  ✓ Docker  29.8.2
  ✓ mongo: local container "dbclone-test-mongodb"  running
  ✓ mysql: local container "dbclone-test-mysql"  running

docker compose run --rm dbclone -from staging -only mongo:demo,mysql:demo -yes
Done 2/2 databases in 1s

Target counts after the clone: demo.orders 5000 documents, demo.users 3000 rows, matching the seeded sources. Logs appeared in ./logs/<run> on the host.