CI: Use a dedicated docker image for LinuxKit

.gitlab-ci.yml

@@ -89,12 +89,9 @@ fickit:
   stage: fickit
   interruptible: true
   needs: []
-  image: alpine:3.18
+  image: nemunaire/linuxkit
   tags: ['docker']
   before_script:
-    - apk add --no-cache git docker
-    - wget -O /usr/bin/linuxkit https://github.com/linuxkit/linuxkit/releases/download/v1.0.1/linuxkit-linux-amd64
-    - chmod +x /usr/bin/linuxkit
     - mkdir -p ~/.docker
     - echo "{\"auths\":{\"${CI_REGISTRY}\":{\"username\":\"${CI_REGISTRY_USER}\",\"password\":\"${CI_REGISTRY_PASSWORD}\"}}}" > ~/.docker/config.json
   script: