fix(ci): fix syntax

Author: pedrobrantes

.github/workflows/ci.yml

@@ -44,11 +44,12 @@ jobs:
           path: nix-image.tar
 
   debug:
-    - name: Debug event
-      run: |
-        echo "Event name: ${{ github.event_name }}"
-        echo "Modified files: ${{ github.event.head_commit.modified }}"
-        echo "Added files: ${{ github.event.head_commit.added }}"
+    steps:
+      - name: Debug event
+        run: |
+          echo "Event name: ${{ github.event_name }}"
+          echo "Modified files: ${{ github.event.head_commit.modified }}"
+          echo "Added files: ${{ github.event.head_commit.added }}"
 
   tests:
     runs-on: ubuntu-latest