There are two aspects to Spark that need work here:
The Docker configs, e.g. setting up a solr environment tuned for Drupal 7.
The Robo commands integrations, e.g. taking db backups, doing site install commands etc for Drupal 7.
The bulk of the work here will be around the Docker config, which @citlacom is currently working on. That piece needs to be done first anyway, in order to then be able to even test the robo tasks. Furthermore I suspect that the the work started by Balint to make the backup solution generic (ie, no longer depend on drush) will mean that the second piece will have a higher success rate with less work.
There are two aspects to Spark that need work here:
The bulk of the work here will be around the Docker config, which @citlacom is currently working on. That piece needs to be done first anyway, in order to then be able to even test the robo tasks. Furthermore I suspect that the the work started by Balint to make the backup solution generic (ie, no longer depend on drush) will mean that the second piece will have a higher success rate with less work.