twine fails to check SSL certificate

Question

I am trying to upload Python package to private gitlab package registry using CI.

  script:
    - poetry build
    - pip install twine
    - echo "[distutils]" > ~/.pypirc
    - echo "index-servers = gitlab" >> ~/.pypirc
    - echo "[gitlab]" >> ~/.pypirc
    - echo "repository=$CI_API_V4_URL/projects/$CI_PROJECT_ID/packages/pypi" >> ~/.pypirc
    - echo "username=gitlab-ci-token" >> ~/.pypirc
    - echo "password=$CI_JOB_TOKEN" >> ~/.pypirc
    - twine upload --repository gitlab dist/* --verbose --cert /usr/local/share/ca-certificates/ca.crt

When running curl --verbose https://****repository url**** within the same CI job it shows that SSL certificate verify ok..

But CI job fails, showing:

$ twine upload --repository gitlab dist/* --verbose --cert /usr/local/share/ca-certificates/ca.crt
INFO     Using configuration from /root/.pypirc                                 
INFO     ca_cert set by command options                                         
Uploading distributions to 
https://***********.com/api/v4/projects/53/packages/pypi
INFO     dist/************.whl (30.0 KB)                
INFO     dist/************.tar.gz (25.1 KB)                          
INFO     username set from config file                                          
INFO     password set from config file                                          
INFO     username: gitlab-ci-token                                              
INFO     password: <hidden>                                                     
Uploading ************.whl
WARNING  Retrying (Retry(total=9, connect=5, read=None, redirect=None,          
         status=None)) after connection broken by                               
         'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED]
         certificate verify failed: unable to get local issuer certificate   

Please suggest what can be wrong or what can I try to do as well?

p.s. I have also tried using Poetry directly:

    - poetry build
    - poetry config repositories.gitlab "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/packages/pypi"
    - poetry config certificates.gitlab.cert "/usr/local/share/ca-certificates/ca.crt"
    - poetry config http-basic.gitlab gitlab-ci-token "$CI_JOB_TOKEN"
    - poetry config --list
    - poetry publish --repository gitlab --username gitlab-ci-token --password $CI_JOB_TOKEN

But it gives error that server is unreachable and I should check url.