Fix CI to check format before running CSS tests

Author: ghivert

.github/workflows/test.yml

@@ -39,12 +39,12 @@ jobs:
           # elixir-version: "1.15.4"
       - run: gleam deps download
         working-directory: sketch_css
+      - run: gleam format --check src test
+        working-directory: sketch_css
       - run: gleam test --target=erlang
         working-directory: sketch_css
       - run: gleam test --target=javascript
         working-directory: sketch_css
-      - run: gleam format --check src test
-        working-directory: sketch_css
 
   test-sketch-lustre:
     runs-on: ubuntu-latest