Natively support musl-based environments

Describe the solution you'd like

• For any core-based SDKs, publish musl-based libraries and have musl-based CI
  • Can wait until first SDK has it to see how CI setup is done best in GitHub
• For the time-skipping test server, build a musl-based binary
• For temporal.download, accept musl=true URL argument to only return musl-specific time-skipping test server
• For Core, make sure to populate musl=true in the URL to temporal.download if compiled in musl triple

Per-SDK Tickets

• Go - N/A
• Java - https://github.com/temporalio/sdk-java/issues/2402
• Core - https://github.com/temporalio/sdk-core/issues/872
• TypeScript - https://github.com/temporalio/sdk-typescript/issues/1621
• Python - https://github.com/temporalio/sdk-python/issues/761
• .NET - https://github.com/temporalio/sdk-dotnet/issues/408
• Ruby - https://github.com/temporalio/sdk-ruby/issues/215
• PHP - N/A
• Temporal CLI - N/A

Start by reading the linked per-SDK tickets, especially the open Java, Core, TypeScript, and Ruby issues, and compare their remaining scope with the solution checklist. Done means the required musl libraries, CI, time-skipping binary, temporal.download behavior, and Core URL handling are implemented or explicitly resolved across the affected SDKs.