Jumping around of the dockerfile/docker-compose context - docker

Question

My current projects structure looks something like that:
/home/some/project
│ .credentials_dev
│ .credentials_prod
│ ca.cer
│ docker-compose.yml
│ Dockerfile
│ init.sql
│ nginx_dev.conf
│ nginx_prod.conf
│
├───src
└───users
Compose makes four containers, two of them are dev & prod version of application, who uses appropriate prod & dev files. As you can see, following structure root is little overloaded, so i'd like to move all the deployment staff into the separate directory to make the following:
/home/some/project
├───deployment
│ .credentials_dev
│ .credentials_prod
│ ca.cer
│ docker-compose.yml
│ Dockerfile
│ init.sql
│ nginx_dev.conf
│ nginx_prod.conf
│
├───src
└───users
The idea is to receieve in the result following structure on the docker host:
host
├───dev
│ ├───src
│ └───users
├───prod
│ ├───src
│ └───users
└───project
├───deployment
│ .credentials_dev
│ .credentials_prod
│ ca.cer
│ docker-compose.yml
│ Dockerfile
│ init.sql
│ nginx_dev.conf
│ nginx_prod.conf
│
├───src
└───users
and two containers app_dev and app_prod, which volumes are appropriate mounted into folders /host/dev and /host/prod.
I tried multiple solutions found here, but all of them in different variations returned the following errors:
ERROR: Service 'app_dev' failed to build: COPY failed: stat /var/lib/docker/tmp/docker-builder264200969/ca.cer: no such file or directory
ERROR: Service 'app_dev' failed to build: COPY failed: Forbidden path outside the build context: ../ca.cer ()
Error is always appears while docker-compose is trying to build an image, on that string:
COPY deployment/ca.cer /code/
Please tell me how to achieve the desired result.

Answer 1

The Deployment folder is outside of the build context. Docker will pass all the files inside the deployment file as the build context. However the deployment folder itself is outside of it.
Change your copy statement to be instead :
COPY ./ca.cer /code/
Since in the image you are already in that folder.