Update for docker container

It is recommended that users pull the tags pointing to specific passbolt versions when running in environments other than testing.

To update passbolt, you would just need to change the image tag in your docker-compose.yml file:

 image: passbolt/passbolt:<IMAGE_TAG>

Then relaunch your docker containers:

$ docker-compose up -d

By doing this:

• a new passbolt docker image will be pulled and a new container created
• your passbolt database schema will be updated