with-docker example: COPY instruction in builder stage takes a long time

[spacjalex]

Summary

Hey there!

I'm rather inexperienced when it comes to Docker and turborepo. Currently working on improving an existing CI/CD pipeline following the with-docker example and these docs.

Setup: several Next.js apps in a monorepo, Storybook instance, some UI packages and shared functionality.

Right now everything works, but the builds of the Docker images are super slow. Problem: the COPY . . instruction in the Dockerfile's builder stage takes a long time, as it copies over a rather large amount of files. See snippet below (2nd last line). Before running RUN turbo prune, we're copying over the whole project (= several other Next.js apps, and packages that are possibly needed for the app we're pruning for on the last line). Any idea how to streamline this? Is this intended to work like this?

FROM base AS builder
RUN apk update
RUN apk add --no-cache libc6-compat
WORKDIR /builder

RUN pnpm install -g turbo
COPY . .
RUN turbo prune <app_name> --docker

Many thanks, all help much appreciated! Also any further tips in how to generally set up a lean process for this kind of setup.. (caching etc. will be next, after getting the builds to be faster).

Additional information

No response

Example

No response