try build musl on ubuntu arm host to force cargo-zigbuild

Author: lwshang

dist-workspace.toml

@@ -11,3 +11,6 @@ ci = "github"
 installers = []
 # Target platforms to build apps for (Rust target-triple syntax)
 targets = ["aarch64-apple-darwin", "aarch64-unknown-linux-gnu", "x86_64-apple-darwin", "x86_64-unknown-linux-gnu", "x86_64-unknown-linux-musl", "x86_64-pc-windows-msvc"]
+
+[dist.github-custom-runners]
+x86_64-unknown-linux-musl = "ubuntu-22.04-arm" # force dist build to use cargo-zigbuild on this target