Git push from inside a gitlab-runner

GitLab CI/CD
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5

In case others are wondering, I found a nice guide to set this up with shared GitLab runners and compiled it into another answer here.

In short:

deploy:
  stage: deploy
  before_script:
    - 'which ssh-agent || ( apt-get update -qy && apt-get install openssh-client -qqy )'
    - eval `ssh-agent -s`
    - echo "${SSH_PRIVATE_KEY}" | tr -d '\r' | ssh-add - > /dev/null # add ssh ke
    - mkdir -p ~/.ssh
    - chmod 700 ~/.ssh
    - echo "$SSH_PUBLIC_KEY" >> ~/.ssh/id_rsa.pub
    - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
  script:
    - git config --global user.email "${CI_EMAIL}"
    - git config --global user.name "${CI_USERNAME}"
    - git add -f *.pdf # Force add PDF since we .gitignored it
    - git commit -m "Compiled PDF from $CI_COMMIT_SHORT_SHA [skip ci]" || echo "No changes, nothing to commit!"
    - git remote rm origin && git remote add origin git@gitlab.com:$CI_PROJECT_PATH.git
    - git push origin HEAD:$CI_COMMIT_REF_NAME # Pushes to the same branch as the trigger
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