Added the tree command.

Dockerfile

@@ -8,6 +8,13 @@ COPY . .
 RUN mkdir output
 RUN poetry run python3 generate.py
 
+FROM ubuntu as tree
+RUN apt update && apt install -y tree
+WORKDIR /data
+COPY --from=builder /app/output .
+RUN tree -H . -s -o ../index.html
+RUN mv ../index.html .
+
 FROM halverneus/static-file-server:latest
 WORKDIR /web
-COPY --from=builder /app/output/* ./
+COPY --from=tree /data/* ./