* use fixed postgres & memcached versions & fix missing postgres env var
* remove memcached contaienr build
* fixed another version label
* added postgres password to backup command
* set postgres user & pass in .env file
* fixed postgres in backup container
* use zammad repo
- replaced wget with curl
- made zammad image smaller by using tar.gz install instead of git clone
- moved sed commands to entrypoint
- added variables to entrypoint to set used servers dynamically
- added kubernetes backup cronjob
- added postgresql volume to compose file
- write nginx logs to stdout & stderr
- create zammad user & group manually with uid/gid 1000
- added memcached container (currently develop branch needed)
- put all zammad services in one kubernetes pod to be able to use empty dir volume for tmp
- switched to kubernetes deployments
- switched to ReadWriteOnce kubernetes volume claims
- added init container to elasticsearch & zammad kubernetes deployments
- added IMAGE_REPO var for docker compose to .env file
- run nginx from zammad container (preparation for stateless updates)
- removed docker-compose-build.yml
- use private docker repos in compose & kubernetes
- change compose volume names
