GitLab CI configuration should be valid but isn't: jobs:build:before_script config should be a string or a nested array of strings up to 10 levels deep.

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Summary

This GitLab CI configuration is invalid: jobs:build:before_script config should be a string or a nested array of strings up to 10 levels deep.

This error message appears when I add a : character inside a string in a gitlab ci yml before_script section, removing the : makes the pipeline be considered valid.

Steps to reproduce.

• Add the following before_script to a job

  before_script:
    - curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
    - export NVM_DIR="$HOME/.nvm"
    - \[ -s "$NVM_DIR/nvm.sh" \] && \. "$NVM_DIR/nvm.sh" # This loads nvm
    - \[ -s "$NVM_DIR/bash_completion" \] && \. "$NVM_DIR/bash_completion" # This loads nvm bash_completion
    - nvm --version
    - nvm install 16
    - npm --version
    - node --version
    - if [ -z "$BUILD_ENV" ]; then echo "Error: BUILD_ENV is empty"; exit 1; fi

What is the current bug behavior?

It will display the following error message: This GitLab CI configuration is invalid: jobs:build:before_script config should be a string or a nested array of strings up to 10 levels deep.

Removing the : in the last line makes the pipeline be considered valid.

What is the expected correct behavior?

Should be a valid pipeline already with the Error: BUILD_ENV, it should not require me to write Error BUILD_ENV.

Relevant logs and/or screenshots

: PRESENT

REMOVING JUST THE :