feat: add sync instance Dockerfile and snapshot script

Description

• add sync instance Dockerfile
• add a snapshot script supporting a sync instance

Related issue

internal#70

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes

Closes #70 (closed)