delete everything in openshift except opened merge requests on gitlab ( due resource limitation )

.gitlab-ci.yaml

stages:
  - test
  - build
  - deploy
variables:
  OKD_REGISTRY: 'yourprivateregistry'
  OKD_PROJECT: ${CI_PROJECT_NAME}


cleanup-okd:
  stage: test
  image: openshift/origin-cli
  script:
    - .okd/cleanup.sh
  allow_failure: true

##################### test deployment on merge requests #####################
cleanup-merge-okd:
  stage: test
  image: openshift/origin-cli
  script:
    - ./okd/cleanup.sh
  allow_failure: true
  only:
  - merge_requests


merge-validation:
  stage: test
  image: node:12.14
  script: npm run mergeCheck
  only:
  - merge_requests

build-testing:
  stage: build
  image: docker:git
  variables:
    OKD_REGISTRY_IMAGE: "$OKD_REGISTRY/$OKD_PROJECT/$CI_PROJECT_NAME"
  script: |
    docker login -u gitlab-ci -p ${OKD_PWA_TESTING_TOKEN} ${OKD_REGISTRY}
    docker build \
      --build-arg NPM_REPO_PASSWORD=${NPM_REPO_PASSWORD} \
      --build-arg NPM_REPO_USER=${NPM_REPO_USER} \
      -t ${OKD_REGISTRY_IMAGE}:${CI_COMMIT_REF_SLUG} \
      -f Dockerfile .

    docker push ${OKD_REGISTRY_IMAGE}:${CI_COMMIT_REF_SLUG}
  only:
    - merge_requests

deploy-testing:
  image: openshift/origin-cli
  stage: deploy
  before_script:
    - oc version
    - oc login https://okd.private.teh-1.snappcloud.io --token=${OKD_PWA_TESTING_TOKEN}
    - oc project ${OKD_PROJECT}
    - oc create configmap ${CI_COMMIT_REF_SLUG}-${CI_PROJECT_NAME}-env --from-env-file=.env.default.config --dry-run -o yaml | oc apply -f -
    - oc process -f .okd/okd.yml --param ROUTE_HOST=${CI_ENVIRONMENT_URL} --param PROJECT_NAME=${CI_PROJECT_NAME} --param APP_NAME=${CI_COMMIT_REF_SLUG}-${CI_PROJECT_NAME} --param IMAGE_TAG=${CI_COMMIT_REF_SLUG} | oc apply -f -
    - 'echo -e " ############# \033[0;31mThe Project Deployed On Following Url\033[0m ############# "'
    - 'echo -e " ############# \033[0;32m$CI_ENVIRONMENT_URL\033[0m ############# "'
  script:
    - oc rollout latest dc/${CI_COMMIT_REF_SLUG}-${CI_PROJECT_NAME}
  environment:
    name: Testing
    url: ${CI_COMMIT_REF_SLUG}-${CI_PROJECT_NAME}-${CI_PROJECT_NAMESPACE}.apps.public.teh-1.snappcloud.io
  only:
    - merge_requests

cleanup.sh

#!/bin/bash

exclude=/tmp/exclude.txt

echo "get branches"

curl --header "PRIVATE-TOKEN: ${GITLAB_TOKEN}" --silent https://gitlab.com/api/v4/projects/${CI_PROJECT_ID}/merge_requests?state=opened | python -mjson.tool | grep -w source_branch | tr '[:upper:]' '[:lower:]' | awk -F'"' '{print $4}' > ${exclude}

echo "login to okd"

oc login https://okd-url --token=${OKD_PWA_TESTING_TOKEN}

oc project ${CI_PROJECT_NAME}

echo "delete old tags"

oc get ImageStream ${CI_PROJECT_NAME} -o yaml | grep tag |  grep -v develop | grep -v -f ${exclude} | awk -v project=${CI_PROJECT_NAME} 'NR>1{print project":"$2}' | xargs -L1 oc tag -d

echo "delete old deployments"

oc get dc | grep -v develop | grep -v -f ${exclude} |awk 'NR>1{print $1}' | xargs -L1 oc delete dc

echo "delete old configmaps"

oc get cm | grep -v develop | grep -v -f ${exclude} | awk 'NR>1{print$1}' | xargs -L1 oc delete cm