SMERTH

8.1 Composer Scripts

How about using "scripts" you know these!

@ drupal8-site/composer.json

{
    "scripts": {
      "preinstall-cmd": [
        "drupal chain --file=../console/chain/pre.yml"
      ],
      "postinstall-cmd": [
        "drupal chain --file=../console/chain/post.yml"
      ],
      "preupdate-cmd": [
        "drupal chain --file=../console/chain/pre.yml"
      ],
      "postupdate-cmd": [
        "drupal chain --file=../console/chain/post.yml"
      ]
    }
},

8.2 Example of pre command chain

Now you can run commands from a pre.yml or a post.yml files

commands:
    - command: database:dump
    - command: exec
        arguments:
            bin: composer archive --working-dir=../ --dir/tmp/

The database:dump command is a drupal Console command.

The exec command allows you to execute any other shell command

8.3 Example of post command chain

@ post.yml

commands:
    - command: config:import
    - command: update:execute
        arguments:
            module: all

There are plenty or events that can be attached to, this is just an example of uesing pre and post...