Bitbucket pipeline to auto deploy Docker Compose app to Google Kubernetes Engine

bitbucket-pipelines.yml

pipelines:
  branches:
    <BRANCH_NAME>:
      - step:
          services:
            - docker
          name: Deploy to GKE
          deployment: staging
          image: google/cloud-sdk:latest
          script:
            - export DOCKER_COMPOSE_VERSION=1.23.1
            - export DOCKER_COMPOSE_URL=https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-$(uname -s)-$(uname -m)
            - export GCP_PROJECT=<GOOGLE_PROJECT_ID>
            - curl -L $DOCKER_COMPOSE_URL > docker-compose
            - chmod +x docker-compose
            - mv docker-compose /usr/local/bin
            - curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
            - chmod +x ./kubectl
            - mv ./kubectl /usr/local/bin/kubectl
            - gcloud auth activate-service-account --key-file <SERVICE_ACCOUNT_KEY_FILE>
            - gcloud docker --authorize-only --project=$GCP_PROJECT
            - gcloud container clusters get-credentials <CLUSTER_NAME> --zone=<CLUSTER_ZONE> --project=$GCP_PROJECT
            - kubectl config set-context <K8S_CONTEXT>
            - docker-compose build
            - docker-compose push
            - kubectl rollout restart deployments/<APP_DEPLOYMENT>

definitions:
  services:
    docker:
      memory: 3072