Edited the gitlab yml file, following errors during build

.gitlab-ci.yml

@@ -9,6 +9,9 @@ stages:
 
 variables:
     SECURE_FILES_DOWNLOAD_PATH: '.secure'
+    DOCKER_HOST: tcp://docker:2375
+    DOCKER_DRIVER: overlay2
+    DOCKER_TLS_CERTDIR: ""
 
 get-cookie:
   stage: pre-build
@@ -33,6 +36,7 @@ docker-build:
   image: docker:latest
   services:
     - docker:dind
+      alias: docker
   dependencies: 
     - get-cookie
   script:
@@ -40,3 +44,4 @@ docker-build:
     - docker build --build-arg BUILDKIT_INLINE_CACHE=1 --cache-from $CI_REGISTRY_IMAGE:latest --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA --tag $CI_REGISTRY_IMAGE:latest .
     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
     - docker push $CI_REGISTRY_IMAGE:latest
+  privileged: true