fix installation of target for cross-builds in CI

[MusicalNinjaDad]

No description provided.

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider specifying the toolchain/channel explicitly in rustup install (e.g., rustup install stable) to avoid relying on the current default toolchain, which can change and make CI less deterministic.
• If some matrix entries already match the host target, you could skip rustup target add when ${{ matrix.target }} equals the default host triple to slightly speed up the workflow and avoid redundant operations.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider specifying the toolchain/channel explicitly in `rustup install` (e.g., `rustup install stable`) to avoid relying on the current default toolchain, which can change and make CI less deterministic.
- If some matrix entries already match the host target, you could skip `rustup target add` when `${{ matrix.target }}` equals the default host triple to slightly speed up the workflow and avoid redundant operations.

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