SSH persmission denied issue

[webphpprojects]

Hello,
Description

[RuntimeException]                                                                                                                                                                                      
  Failed to execute git clone --no-checkout 'ssh://my repo'
  '/var/www/html/vendor/package' && cd '/var/www/html/vendor/package' && git remote add composer 'ssh://my repo' && git fetch composer && git remote set-url origin 'ssh://my repo' && git remote set-url composer 'ssh://my repo'                                                                                                                    
                                                                                                                                                                                                          
  Cloning into '/var/www/html/vendor/package'...                                                                                                                                                         
  git@my repo: Permission denied (publickey).                                                                                                                                                  
  fatal: Could not read from remote repository.                                                                                                                                                           
                                                                                                                                                                                                          
  Please make sure you have the correct access rights                                                                                                                                                     
  and the repository exists. 

Steps To Reproduce

1. curl -s https://raw.githubusercontent.com/markshust/docker-magento/master/lib/template | bash
2. git clone [email protected]:myrepo.git src
3. echo "127.0.0.1 ::1 yoursite.test" | sudo tee -a /etc/hosts
4. docker-compose up -d
5. rm -rf src/vendor
6. bin/copytocontainer --all
7. bin/composer install

Expected Result
All vendor packages are downloaded
Actual Result
One of the package cannot be downloaded

One more information. If I try to get this repo without docker (this project) - so not using composer - I can clone it - so ssh permission issue is related to docker container and looks that my ssh key was not copied to that container. But I don't know how to fix it. Could you help?

[rangerz]

Uncomment this line
#- ~/.ssh/id_rsa:/var/www/.ssh/id_rsa:cached in docker-compose.dev.yml
and try to restart docker bin/restart
(as same as docker-compose -f docker-compose.yml -f docker-compose.dev.yml up -d --remove-orphans)

[webphpprojects]

Yes, it's a solution, thank you! :)