fix: run sync instance (#152)

Description

fix sync instance:

• check database readiness
• add mount points to sync instance container
• run PostgreSQL instance after sync container restart

Related issue

#152 (closed)

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 #152 (closed)