elixir / main ci

Deprecate IO.read warning in Newsletter exercise #940

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Process completed with exit code 1.

module Mix.Tasks.Format is not a behaviour (in module DoctestFormatter)

module Mix.Tasks.Format is not a behaviour (in module MarkdownCodeBlockFormatter)

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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