Update the Docker version in the gitlab CI script.

.gitlab-ci.yml

@@ -5,13 +5,16 @@ stages:
   - e2e
   - release
 
+variable:
+  DOCKER_VERSION: "24.0.7"
+
 push_to_docker:
-  image: docker:20.10.9
+  image: docker:$DOCKER_VERSION
   stage: release
   only:
     - tags
   services:
-    - docker:20.10.9-dind
+    - docker:$DOCKER_VERSION-dind
   script:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
     - docker pull $CI_REGISTRY_IMAGE/varnish-ingress/haproxy:$CI_COMMIT_REF_NAME
@@ -346,10 +349,10 @@ dev:haproxy-timeouts:
 .integration-tests:
   needs: ["build:controller"]
   stage: e2e
-  image: docker:20.10.9
+  image: docker:$DOCKER_VERSION
   retry: 2
   services:
-    - docker:20.10.9-dind
+    - docker:$DOCKER_VERSION-dind
   variables:
     KUBECTL: v1.22.2
     KIND: v0.11.1
@@ -438,9 +441,9 @@ dev:haproxy-timeouts:
 
 .build-image:
   stage: build1
-  image: docker:20.10.9
+  image: docker:$DOCKER_VERSION
   services:
-    - docker:20.10.9-dind
+    - docker:$DOCKER_VERSION-dind
   variables:
     IMAGE: BASIC
   before_script: