feat: add the ability to backup docker volumes from docker container

[Natanel-Shitrit]

Background

When building my autorestic backup I wanted to avoid installing autorestic locally - this is because I want to avoid manual setups in case I move to a new host.

Problem

I wanted to backup my docker volumes from inside the autorestic docker container.
It was not possible with the stock image due to lack of the docker-cli package.

Changes

• Added docker-cli package.

Example:

# docker-compose.yml
# docker compose run backup
version: "2.1"

services:
  backup:
    image: cupcakearmy/autorestic
    volumes:
      # Docker socket to backup volumes
      - /var/run/docker.sock:/var/run/docker.sock
      # AutoRestic config
      - ./.autorestic.yaml:/.autorestic.yaml
    # Run backup
    entrypoint: ["autorestic", "backup", "--ci", "-va", "-c", "/.autorestic.yaml"]

version: 2

global:
  # ...

locations:
  docker_volumes:
    from:
      - volume_example
    type: volume
    to: remote

backends:
  remote:
    # ...

Related Issues:

• Resolves Docker volume backup not working from within container #334

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Name	Status	Preview	Comments	Updated (UTC)
autorestic	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 15, 2024 1:26pm

[Natanel-Shitrit]

I can add an example to the docs if you are planning to merge this :)

[cupcakearmy]

Thanks, and sorry for being stale for so long. Docs are always welcomed :) I'll merge it.