Error when executing the docker-compose build command on windows

[Simernope]

I use git bash on windows to build a project. In dev mode, everything starts, but when executing docker-compose build, the command crashes with an error:

simeo@Simeon MINGW64 ~/WebstormProjects/condo (master)
$ docker-compose build
[+] Building 0.0s (0/0)  docker:default
[+] Building 9.1s (19/27)                                                                                                                                                                                            docker:default
 => [app internal] load build definition from Dockerfile                                                                                                                                                                       0.5s
 => => transferring dockerfile: 2.13kB                                                                                                                                                                                         0.0s
 => [app internal] load metadata for docker.io/library/buildpack-deps:buster                                                                                                                                                   1.7s
 => [app internal] load metadata for docker.io/library/node:16-buster-slim                                                                                                                                                     1.7s 
 => [app internal] load metadata for docker.io/library/python:3.8-slim-buster                                                                                                                                                  1.7s 
 => [app auth] library/buildpack-deps:pull token for registry-1.docker.io                                                                                                                                                      0.0s
 => [app auth] library/python:pull token for registry-1.docker.io                                                                                                                                                              0.0s
 => [app auth] library/node:pull token for registry-1.docker.io                                                                                                                                                                0.0s 
 => [app internal] load .dockerignore                                                                                                                                                                                          0.2s
 => => transferring context: 355B                                                                                                                                                                                              0.0s 
 => [app node 1/1] FROM docker.io/library/node:16-buster-slim@sha256:3ebf2875c188d22939c6ab080cfb1a4a6248cc86bae600ea8e2326aa03acdb8f                                                                                          0.0s
 => [app base 1/5] FROM docker.io/library/buildpack-deps:buster@sha256:d58af141d3f29e8adebbb0e8338a2eb6834c13db0122b7b2859d30fb072d6c94                                                                                        0.0s 
 => [app python 1/1] FROM docker.io/library/python:3.8-slim-buster@sha256:8799b0564103a9f36cfb8a8e1c562e11a9a6f2e3bb214e2adc23982b36a04511                                                                                     0.0s 
 => [app internal] load build context                                                                                                                                                                                          6.3s 
 => => transferring context: 532.62kB                                                                                                                                                                                          6.1s 
 => CACHED [app base 2/5] COPY --from=python /usr/local/ /usr/local/                                                                                                                                                           0.0s 
 => CACHED [app base 3/5] COPY --from=node /usr/local/ /usr/local/                                                                                                                                                             0.0s 
 => CACHED [app base 4/5] COPY --from=node /opt/ /opt/                                                                                                                                                                         0.0s 
 => CACHED [app base 5/5] RUN set -ex  && groupadd -r app --gid=999  && useradd --system --create-home --home /app --gid 999 --uid=999 --shell /bin/bash app  && rm -f /usr/local/bin/docker-entrypoint.sh  && python --versi  0.0s 
 => CACHED [app stage-5 1/2] WORKDIR /app                                                                                                                                                                                      0.1s 
 => CACHED [app installer 1/5] WORKDIR /app                                                                                                                                                                                    0.0s 
 => ERROR [app installer 2/5] COPY --chown=app:app ./out /app                                                                                                                                                                  0.0s 
------
 > [app installer 2/5] COPY --chown=app:app ./out /app:
------
failed to solve: failed to compute cache key: failed to calculate checksum of ref ca39f5c8-67d4-4e98-8559-c78d7732711f::ndnk8wt25vyttr4sg60td4n7c: "/out": not found

At what point is the out directory created and why is it not there?

[SavelevMatthew]

out directory is used to store pruned repo containing only package.json and yarn.lock files, so we can use docker layer-caching to save time on yarn install step.

You can generate it by running:

sh bin/prune.sh