GitLab CI job for Git push

git_push.yaml

# Usage
# in .gitlab-ci.yml
# commit packages:
#   extends: .git:push
#   stage: deploy
#   variables:
#     COMMIT_MESSAGE: "Hydrated packages"
#   script:
#     cp -r file-to-commit/* "${CI_COMMIT_SHA}/file-to-commit/"
#   dependencies:
#     - "files-come-from-another-job"
# Originally from https://www.benjaminrancourt.ca/how-to-push-to-a-git-repository-from-a-gitlab-ci-pipeline
.git:push:
  image:
    name: alpine/git:v2.30.2
    entrypoint: ['']
  after_script:
    # Go to the new directory
    - cd "${CI_COMMIT_SHA}"

    # Add all generated files to Git
    - git add .

    - |-
      # Check if we have modifications to commit
      CHANGES=$(git status --porcelain | wc -l)

      if [ "$CHANGES" -gt "0" ]; then
        # Show the status of files that are about to be created, updated or deleted
        git status

        # Commit all changes
        git commit -m "${COMMIT_MESSAGE}"

        # Update the repository and make sure to skip the pipeline create for this commit
        git push -o ci.skip
      else
        echo "Nothing to commit"
      fi
  before_script:
    # Clone the repository via HTTPS inside a new directory
    - git clone "https://${GITLAB_USER_NAME}:${GITLAB_TOKEN}@${CI_SERVER_HOST}/${CI_PROJECT_PATH}.git" "${CI_COMMIT_SHA}"
    - cd "${CI_COMMIT_SHA}"
    
    # Check out branch if it's not master
    # TODO: In MR pipelines, use ${CI_MERGE_REQUEST_SOURCE_BRANCH_NAME}
    - |
      if [[ "${CI_COMMIT_BRANCH}" != "${CI_DEFAULT_BRANCH}" ]]; then
        git fetch
        git checkout -t "origin/${CI_COMMIT_BRANCH}"
      fi

    - git branch
    # Set the displayed user with the commits that are about to be made
    - git config --global user.email "${GIT_USER_EMAIL:-$GITLAB_USER_EMAIL}"
    - git config --global user.name "${GIT_USER_NAME:-$GITLAB_USER_NAME}"

    - cd "${CI_PROJECT_DIR}"