Gitlab job failed when I try to build Docker image - docker

Question

There is the following Dockerfile:
FROM node:12.22-alpine3.12 as builder
RUN mkdir /app
COPY . /app
WORKDIR /app
RUN npm i && npm build
FROM nginx:alpine
WORKDIR /usr/share/nginx/html
RUN rm -rf ./*
EXPOSE 80
COPY --from=builder /app/build ./
ENTRYPOINT ["nginx", "-g", "daemon off;"]
There is nothing smart - just build static JS app and put it to nginx directory. It works locally excellent. But it failed on Gitlab with the following error:
Step 8/11 : RUN rm -rf ./*
---> Running in a9cf55a3da31
Removing intermediate container a9cf55a3da31
---> 50c9a02d542d
Step 9/11 : EXPOSE 80
---> Running in edda7f7bf296
Removing intermediate container edda7f7bf296
---> be2caf89404f
Step 10/11 : COPY --from=builder /app/build ./
COPY failed: stat /var/lib/docker/overlay2/6a441679247bd4e1a321f7c6e15d4fe8dd59c5013d4e0058b7f3c9f395c20f98/merged/app/build: no such file or directory
Cleaning up file based variables
00:02
ERROR: Job failed: command terminated with exit code 1
And I don't understand what does it mean, because locally it works without any troubles at all.
UPD: my .gitlab-ci.yml:
stages:
- test
- build
test:
stage: test
image: node:12.22-alpine3.12
script:
- echo 'Test Success'
build:
image: docker:19.03.12
stage: build
services:
- docker:19.03.12-dind
variables:
DOCKER_HOST: tcp://docker:2375
DOCKER_TLS_CERTDIR: ""
before_script:
- docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
script:
- docker build -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG.$CI_PIPELINE_ID" .
- docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG.$CI_PIPELINE_ID"