Remove snap callout from docker setup for linux · umccr/cwl-novice-tutorial@0eddd34

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/[email protected], actions/upload-artifact@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

[incorrect formatting]: [Common Workflow Language project][cwl-site] -> [Common Workflow Language project](cwl-site)

[missing anchor]: [Windows Setup](#windows-setup)

[missing anchor]: [MacOS Setup](#macos-setup)

[missing anchor]: [Linux Setup](#linux-setup)

[uninformative link text]: [Click here](https://docs.docker.com/engine/install/#supported-platforms)

The following artifacts were uploaded using a version of actions/upload-artifact that is scheduled for deprecation: "built", "diff", "pr". Please update your workflow to use v4 of the artifact actions. Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

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