Bugfix/#99 deploy correct version

Bug fix/Feature

Summary

This MR provides …

• a new API endpoint with which we can deploy a certain version of the Ahiqar application on a server. ❗ I only consider this important for ahikar-test. IMHO we should take care of the newest version being installed on ahikar-dev.
• a bug fix in checking the deployment token

Compliance to “Definition of Done”

• Unit tests passed
• Code reviewed
• Acceptance criteria met
• Functional tests passed
• Non-Functional requirements met
• Product Owner accepts the User Story

Related

Closes

#99

Changelog

• I added a statement to the CHANGELOG.

Version number

• I bumped the version number in build.properties.

Readme and general docs

• I updated the README (if applicable) and kept the docs up to date.

/cc Mathias Göbel, Frank Schneider, Michelle Weidling