simplify dockerfile

Dockerfile

@@ -4,13 +4,9 @@ COPY . /app
 RUN npm install
 RUN npm run build
 
-FROM caddy:2.9-builder AS caddy
-COPY --from=builder /app/dist /srv
-COPY Caddyfile /etc/caddy/Caddyfile
-RUN which caddy
-
 FROM gcr.io/distroless/base-debian12
-COPY --from=caddy /srv /srv
-COPY --from=caddy /usr/bin/caddy /usr/bin/caddy
+COPY Caddyfile /etc/caddy/Caddyfile
+COPY --from=builder /app/dist /srv
+COPY --from=caddy:2.9-builder /usr/bin/caddy /usr/bin/caddy
 EXPOSE 7860
 ENTRYPOINT ["/usr/bin/caddy", "run", "--config", "/etc/caddy/Caddyfile"]