Explain how to add ssh keys to container

[damien-carcel]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	no
RFC?	no
Affected image and tag	all

When using akeneo/pim-enterprise-standard, one have to install akeneo/pim-enterprise-dev through composer, and so need to add her/his SSH key to the container.

• [x] Investigate if Docker secrets are relevant here (could store the password?) => Not needed, see comment below
• [x] Update the compose file template in akeneo/pim-enterprise-standard starting Akeneo 1.7
• [ ] Document the usage here, and link it in the Akeneo documentation

[damien-carcel]

It is possible to use the host ssh agent with the SSH_AUTH_SOCK environment variable:

services:
  akeneo:
    environment:
      ...
      SSH_AUTH_SOCK: '/ssh-agent'
    volumes:
      ...
      - ${SSH_AUTH_SOCK}:/ssh-agent:ro