diff --git a/.gitea/workflows/test-build.yaml b/.gitea/workflows/test-build.yaml
index ae559e9..2382451 100644
--- a/.gitea/workflows/test-build.yaml
+++ b/.gitea/workflows/test-build.yaml
@@ -15,4 +15,10 @@ jobs:
       - name: Generate the themes
         run: npm run generate
       - name: Check the output
-        run: ls -1 output/
+        run: [$(ls -1 output/ | wc -l) != 0]
+      - name: Copy the files
+        run: |-
+          (cd output && tar c .) | docker run -i \
+            -v /srv/gitea/gitea/public/assets/css:/srv/gitea/gitea/public/assets/css \
+            -w /srv/gitea/gitea/public/assets/css \
+            alpine:1.23 sh -c 'rm theme-doki*.css && tar x'