Chore: bump lq ci version to 2.2.4

.gitlab-ci.yml

 image:
-  name: savonet/liquidsoap:v2.1.0
+  name: savonet/liquidsoap:v2.2.4
   entrypoint: [""]
 
 stages:
@@ -24,13 +24,11 @@ check_spelling:
   stage: test
   before_script:
     - *install_requirements
-  script:
-    make spell
+  script: make spell
 
 check_code:
   stage: test
-  script:
-    liquidsoap --check src/engine.liq
+  script: liquidsoap --check src/engine.liq
 
 run_tests:
   stage: test
@@ -88,7 +86,7 @@ release_job:
   script:
     - echo "this will be a release when there is a tag, but tags should be protected to be only createable by maintainers."
   release:
-    name: 'Release $CI_COMMIT_TAG'
+    name: "Release $CI_COMMIT_TAG"
     description: ./CHANGELOG.md
-    tag_name: '$CI_COMMIT_TAG'
-    ref: '$CI_COMMIT_TAG'
+    tag_name: "$CI_COMMIT_TAG"
+    ref: "$CI_COMMIT_TAG"