ci: add conda package build workflow

[Luohaothu]

Summary

• add a dedicated GitHub Actions workflow at .github/workflows/conda-package.yml
• build conda package variants for fixed matrix: linux/macos x mpi(nompi/openmpi/mpich) x openmp(on/off)
• keep matrix fail-fast: false so all jobs run, while workflow still fails if any variant fails
• remove Run CI label gating so this workflow always runs when triggered

Test Plan

• verify workflow YAML parses successfully (ruby -e "require 'yaml'; YAML.load_file('.github/workflows/conda-package.yml')")
• rely on GitHub Actions CI checks in this PR for end-to-end validation

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat-workflow

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