ci: skip freeing disk space in reduced builds (#7884)

.github/workflows/build.yml

@@ -306,7 +306,7 @@ jobs:
 
       # Otherwise we run out of disk space with Docker build
       - name: Free disk space
-        if: matrix.should_run == true || matrix.kotlin == true
+        if: (matrix.should_run == true || matrix.kotlin == true) && needs.maybe-release.outputs.reduced != 'true'
         shell: bash
         run: ./scripts/ci/linux_util_free_space.sh