Add GitHub Actions workflow for building binaries and images

[lgc2333]

before merge, maybe you should modify trigger condition, tags in docker/metadata-action, and so on

• try executables -> https://github.com/lgc2333/phira-mp/actions/runs/18382771181
• try docker images: (https://github.com/lgc2333/phira-mp/pkgs/container/phira-mp-server)
  • Pull: docker pull ghcr.io/lgc2333/phira-mp-server:latest
  • Compose: (undo all comments if you are using 1panel)

    services:
      phira-mp:
        image: ghcr.io/lgc2333/phira-mp-server:latest
        container_name: phira-mp
        environment:
          RUST_LOG: debug
        ports:
          - 12346:12346
        volumes:
          - ./log:/app/log
        # networks:
        #   - 1panel-network
        restart: unless-stopped
    
    # networks:
    #  1panel-network:
    #    external: true

resolve #30