refactor: drop postbuild step

Dockerfile

@@ -7,7 +7,6 @@ COPY . .
 RUN npm i -g pnpm@9
 RUN pnpm i --frozen-lockfile
 RUN pnpm build
-RUN pnpm postbuild
 
 # final image
 FROM registry.odit.services/library/nginx-brotli:3.15 AS final