build linux musl by default

[ashleygwilliams]

while not entirely simple, there is a known path for compiling musl bins and i think we should be doing it by default - partially because it will help bring us to parity with folks looking to transition to dist

some examples:

• https://github.com/cloudflare/wrangler-legacy/blob/master/.github/workflows/release.yml#L55
• https://github.com/apollographql/rover/blob/27de7ed0ebb56943a1db37b7f22fb649b3e9d801/.circleci/config.yml#L308
• https://github.com/rustwasm/wasm-pack/blob/master/.github/workflows/release.yml#L55

[Gankra]

dupe of #75 ?

[ashleygwilliams]

oh whoops, i went looking for it and just somehow didn't see it, closing in favor of that