internal: add clang-format to the dev image

[nic11]

Important

Add clang-format-15 to Dockerfile for code formatting support in the dev image.

• Dockerfile Update:
  • Add clang-format-15 to the list of installed packages in Dockerfile to support code formatting.

^{This description was created by for 78e36ec. It will automatically update as commits are pushed.}

[ellipsis-dev]

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1. Dockerfile:46

• Draft comment:
  Adding clang-format-15 is consistent with the existing clang-15 installation, ensuring code formatting tools are available in the development environment.
• Reason this comment was not posted:
  Confidence changes required: 0%
  The addition of clang-format-15 is consistent with the existing clang-15 installation, ensuring that the development environment has the necessary tools for code formatting. This is a straightforward addition to the Dockerfile.

Workflow ID: wflow_8OIYeQvOkP3gtREl

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[Pospelove]

I added it here https://github.com/skyrim-multiplayer/skymp/blob/main/.devcontainer/Dockerfile

I would recommend trying devcontainers, VS Code supports them. But if u wish we can add it here too. Approve

[nic11]

It's like 50-60 extra KB in the image and would let anyone easily run the same formatting that is expected, if they already build using that.

But yeah we can try building devcontainers, rn I see that at least some flags that are written in the docs can be instead specified in the config https://containers.dev. Although I would prefer them to have support for podman --userns=keep-id. Not sure if it's easily adjustable in the current state