Bugfix/#89 session

Bug fix

Summary

We now get the sessionId from a binary file stored in the db. This file is created on demand and renewed when older then 24h. Instead of reading the session id from env var directly, a new env var TGLOGIN contains the needed credentials. This env var has to be present directly in the secret variables and within the secret var SECRETS - from where it will be added to docker env.

Compliance to “Definition of Done”

• Unit tests passed
• New unit tests added for new functions
• Code reviewed
• Product Owner accepts the User Story

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.

Closes #89 (closed)

/cc Mathias Göbel, Frank Schneider, Michelle Weidling