Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -22,7 +22,7 @@ stages:          # List of stages for jobs, and their order of execution
 
 build-job:       # This job runs in the build stage, which runs first.
   stage: build
-  image: cimg
+  image: debian
   #artifacts:
   #  paths:
   #    - "*.bin"