Fix Docker image in CI/CD example

Author: Julien Neuhart

docs/docs/16_Deployments/3_CICD.md

@@ -16,7 +16,7 @@ stages:
 
 api_tests:
   stage: tests
-  image: thecodingmachine/php:7.4-v3-apache
+  image: thecodingmachine/php:7.4-v3-cli
   services:
     - name: mysql:8.0
       command: ["--default-authentication-plugin=mysql_native_password"]
@@ -141,4 +141,4 @@ webapp_build_push_docker_image_prod:
   variables:
     NUXTJS_ENV_CONTENT: "$NUXTJS_ENV_CONTENT_PROD" # .env file content for prod (from GitLab CI/CD variables).
     ENV_NAME: "prod"
-```
+```