Storing Intellij Idea preferences between workspace restart

[vzhukovs]

Is your task related to a problem? Please describe.

There is a need to store preferences that is needed for Intellij Idea.

Describe the solution you'd like

At this moment preferences are located at /home/user/.config/JetBrains/IdeaIC2020.2 directory. This directory should be mounted and moved to another place. Intellij Idea's flexibility supports to configure location of configuration directory through the startup options. But on the other hands, needs to find out if this property can be configured via environment variable. Also the volume mount should be configured as persistent volume.

Describe alternatives you've considered

Mechanism that will serialize main preferences and store it in user settings like it has been done for Theia editor. But this requires creating bi-directional synchronization mechanism. It can be done as the next step in future.

Additional context

Command to run idea: https://github.com/che-incubator/che-editor-intellij-community/blob/master/supervisord.conf#L22
Volume mounts can be observed in meta.yaml: https://raw.githubusercontent.com/vzhukovskii/devfiles/master/meta.yaml
Directory for storing preferences: https://github.com/che-incubator/che-editor-intellij-community/blob/master/Dockerfile#L14

Documentation link:
Changing IDE default directories used for config, plugins, and caches storage