Docker image build fails with `"/dist": not found`

[schildbach]

Steps to reproduce

(in the project root directory, tag v0.7.0)

docker build .

Outcome

What did you expect?

A ready to run Docker image.

What happened instead?

$ docker build .
[+] Building 2.7s (7/8)                                                                                                       docker:default
 => [internal] load build definition from Dockerfile                                                                                    0.3s
 => => transferring dockerfile: 149B                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                       0.2s
 => => transferring context: 53B                                                                                                        0.0s
 => [internal] load metadata for docker.io/nginxinc/nginx-unprivileged:alpine                                                           1.9s
 => [auth] nginxinc/nginx-unprivileged:pull token for registry-1.docker.io                                                              0.0s
 => [1/3] FROM docker.io/nginxinc/nginx-unprivileged:alpine@sha256:c03cfec61c6ed6a8e6c34749e9bf77e0a01d8f7e352afaf500e2a619459b01c6     0.3s
 => => resolve docker.io/nginxinc/nginx-unprivileged:alpine@sha256:c03cfec61c6ed6a8e6c34749e9bf77e0a01d8f7e352afaf500e2a619459b01c6     0.3s
 => [internal] load build context                                                                                                       0.2s
 => => transferring context: 596B                                                                                                       0.0s
 => ERROR [2/3] COPY ./dist /app                                                                                                        0.0s
------
 > [2/3] COPY ./dist /app:
------
Dockerfile:3
--------------------
   1 |     FROM nginxinc/nginx-unprivileged:alpine
   2 |     
   3 | >>> COPY ./dist /app
   4 |     COPY config/nginx.conf /etc/nginx/conf.d/default.conf
   5 |     
--------------------
ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref af93a94e-b8ad-4377-bb2a-ee82460f7175::pdga3ubwe68qvkf6kfjd3kpkt: "/dist": not found

Operating system

Ubuntu

Browser information

n/a

URL for webapp

n/a

Will you send logs?

No

[fkwp]

you need to run the build steps as described in the README before.

[schildbach]

Now I'm confused. The entire point of "docker build" is you don't need to fiddle around with custom build steps and special build requirements (yarn?). I'd expect the entire build to happen within Docker. See for example Synapse who are doing it this way – no need to install Python.