[Feature]: Expand CI/release to build for all platforms irf supports

[harryswift01]

Feature Request

Problem / Motivation

CI and the release workflow currently only build and publish SIST for linux-64. SIST's own runtime dependency, the Bioconda irf package, is also available for linux-aarch64 and osx-arm64.

Proposed Solution

• Add a build matrix to the CI and release workflows covering linux-64, linux-aarch64, and osx-arm64.
• Build and test the Conda package on each platform before publishing

Expected Impact

• SIST becomes installable via Conda on Apple Silicon and ARM Linux, not just linux-64.
• No change to existing linux-64 behaviour.