feat: add code formatting check to CI workflow

[Copilot]

Fix: #39

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[nomeguy]

@copilot fix the new linter's error:

Run mix format --check-formatted
  mix format --check-formatted
  shell: /usr/bin/bash -e {0}
  env:
    INSTALL_DIR_FOR_OTP: /home/runner/work/_temp/.setup-beam/otp
    INSTALL_DIR_FOR_ELIXIR: /home/runner/work/_temp/.setup-beam/elixir
** (Mix) mix format failed due to --check-formatted.
The following files are not formatted:

  * lib/acx/persist/ecto_adapter.ex
  * test/persist/readonly_file_adapter_filtered_test.exs
  *

[Copilot]

@copilot fix the new linter's error:

...

Fixed in a9c1f5d. The formatting issues have been resolved:

• Removed trailing whitespace in lib/acx/persist/ecto_adapter.ex
• Fixed indentation and line breaks in test/persist/readonly_file_adapter_filtered_test.exs

All files now pass mix format --check-formatted.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)
• packages.erlang-solutions.com
  • Triggering command: wget REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[github-actions]

🎉 This PR is included in version 1.5.0 🎉

The release is available on GitHub release

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