Improve build endpoint in SCXA

[ke4]

Changes:

• Use gradle-git-properties plugin to provide build information that could be useful to a developer for debugging purposes. Currently it returns this information:

{
   "Build version": "1.0.0",
   "Git branch": "develop",
   "Latest commit ID": "809f75d6ad696efc2e7fb7edc0b20b95620de1a4",
   "Latest commit message": "Update docker-compose.yml for postgres to follow changes in db-scxa repo"
}

We can add more information later if needed.

This PR closing this issue: Make the json/build endpoint up-to-date