release deploy: Initial implementation

Signed-off-by: Ondrej Kupka <ondra.cap@gmail.com>
release start: Trigger Jenkins deploy job

The last step in the whole release start process is now to trigger a
Jenkins job that will take care of deployment into the QA environment so
that the QA team can be asked to start testing immediately.

Signed-off-by: Ondrej Kupka <ondra.cap@gmail.com>
Finished feature 54107089/deploy-on-release-start.