Merge pull request 'ozg-5641 add helmchart' (#1) from ozg-5641-add-helmchart into master

Jenkinsfile

elster-transfer/Chart.yaml

elster-transfer/lint-values.yaml

elster-transfer/templates/_helpers.tpl

elster-transfer/templates/deployment.yaml

elster-transfer/templates/etr_home_pvc.yaml

elster-transfer/templates/network_policy.yaml

elster-transfer/templates/service.yaml

elster-transfer/templates/service_account.yaml

elster-transfer/unit-tests/deployment_basic_spec_test.yaml

...nit-tests/deployment_container_security_context_test.yaml

elster-transfer/unit-tests/deployment_env_test.yaml

...transfer/unit-tests/deployment_imagepull_secret_test.yaml

elster-transfer/unit-tests/deployment_resources_test.yaml

...-transfer/unit-tests/deployment_service_account_test.yaml

elster-transfer/unit-tests/deployment_volume_mount_test.yaml

elster-transfer/unit-tests/etr_home_pvc_test.yaml

elster-transfer/unit-tests/network_policy_test.yaml

elster-transfer/unit-tests/service_account_test.yaml

elster-transfer/unit-tests/service_test.yaml