Fix yml syntax error I introduced in previous commit

Author: emiliom

.github/workflows/build-image.yml

@@ -65,7 +65,6 @@ jobs:
       image_name: ${{ steps.env_var.outputs.image_name }}
       image_ref: ${{ steps.env_var.outputs.image_ref }}
 
-    steps:
     steps:
       - name: Delete huge unnecessary tools folder
         run: rm -rf /opt/hostedtoolcache