fix: display version for the Database Lab v2 builds

Description

There is a bug with displaying of version for the Database Lab v2 builds

$ dblab --version
dblab version -

$ sudo docker logs dblab_server
2021/02/26 16:06:13 [INFO]   Database Lab version:  -
2021/02/26 16:06:13 [INFO]   Database Lab Instance ID: c0shot9889brr5am0co0

Examples

Display version for the Database Lab v2 builds

$ dblab --version
dblab version 2.2.1-1-g66554a8-20210226-1616

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