remove obsolete deployments

.gitlab-ci.yml

-variables:
-  DOCKER_TAG: latest
-  DOCKER_FILE: Dockerfile
-  DOCKER_IMAGE: ${CI_REGISTRY_IMAGE}
-  GIT_SUBMODULE_STRATEGY: normal
-  GIT_LFS_SKIP_SMUDGE: 1
-
-stages:
-  - deploy
-
-deploy:production:
-  stage: deploy
-  variables:
-    KUBECONFIG: /root/.kube/config
-  environment:
-    name: production
-    url: https://gin3.osbyexample.com
-  image: ${CI_REGISTRY}/acs/internal/cloud/kubernetes/deployment:2
-  before_script:
-    - mkdir -p $(dirname ${KUBECONFIG})
-    - echo "${KUBECONFIG_ENCODED}" | base64 -d > ${KUBECONFIG}
-    - kubectl version
-  script:
-    - kubectl -n teaching-os apply -f deployment.yaml
-  only:
-    refs:
-      - main

deployment.yaml

-apiVersion: networking.k8s.io/v1
-kind: Ingress
-metadata:
-  name: gin3-image
-  namespace: teaching-os
-  annotations:
-    kubernetes.io/ingress.class: nginx
-    cert-manager.io/cluster-issuer: letsencrypt-prod
-    eonerc.rwth-aachen.de/description: "GIN3 Image"
-    nginx.ingress.kubernetes.io/configuration-snippet: 'return 302 https://git.rwth-aachen.de/acs/public/teaching/gin3/image-server/-/raw/main/vm_image.tar.gz;'
-spec:
-  tls:
-  - hosts:
-    - image.osbyexample.com
-    - image.os.rwth-aachen.de
-    secretName: letsencrypt-prod-gin3-slides