Update .gitlab-ci.yml

.gitlab-ci.yml

+.cache:
+  cache:
+    key: ${CI_COMMIT_REF_SLUG}
+    policy: pull
+    paths:
+      - target/java-maven-app-1.1.0-SNAPSHOT.jar
 
 stages:
   - install
   - build
+  - deploy
 
 maven-job:
   stage: install
+  extends: .cache
   image:  maven:3-jdk-11
   script:
     - mvn clean package
     - mvn package
+  cache:
+    policy: push
 
 
 docker-build-job:
   stage: build
-  image: docker:latest
+  extends: .cache
+  image: docker:20.10.10
+  before_script:
+    - echo $DOCKER_REGISTRY_PASS | docker login  -u $DOCKER_REGISTRY_USER --password-stdin
   script:
-    - docker build -t nisum-cicd-task:latest
\ No newline at end of file
+    - docker build -t usmanbaloch/nisum-cicd-task:latest .
+    - docker push usmanbaloch/nisum-cicd-task:latest
+  services:
+    - docker:20.10.10-dind
+
+deploy-on-k8s:
+ stage: deploy
+ image: google/cloud-sdk
+ script:
+# Authenticate with GKE
+   - echo "$SERVICE_ACCOUNT_KEY" > key.json
+   - gcloud auth activate-service-account --key-file=key.json
+   - gcloud config set project $GCP_PROJECT_NAME
+   - gcloud config set container/cluster $GKE_CLUSTER_NAME
+   - gcloud config set compute/zone $GKE_CLUSTER_ZONE
+   - gcloud container clusters get-credentials $GKE_CLUSTER_NAME --zone $GKE_CLUSTER_ZONE --project $GCP_PROJECT_NAME
+  # - sed -i "s/<VERSION>/${CI_COMMIT_SHORT_SHA}/g" deployment.yaml
+   - kubectl apply -f dep-nisum-cicd.yaml
\ No newline at end of file