Set up musl support

lib/h3_geo.ex

@@ -6,6 +6,8 @@ defmodule H3Geo do
     crate: :h3geo,
     base_url: "https://github.com/breakroom/h3geo/releases/download/v#{version}",
     force_build: System.get_env("H3GEO_BUILD") in ["1", "true"],
+    targets:
+      Enum.uniq(["aarch64-unknown-linux-musl" | RustlerPrecompiled.Config.default_targets()]),
     version: version
 
   @doc """

native/h3geo/.cargo/config.toml

@@ -1,5 +1,10 @@
 [target.'cfg(target_os = "macos")']
-rustflags = [
-    "-C", "link-arg=-undefined",
-    "-C", "link-arg=dynamic_lookup",
-]
+rustflags = ["-C", "link-arg=-undefined", "-C", "link-arg=dynamic_lookup"]
+
+# See https://github.com/rust-lang/rust/issues/59302
+[target.x86_64-unknown-linux-musl]
+rustflags = ["-C", "target-feature=-crt-static"]
+
+# Provides a small build size, but takes more time to build.
+[profile.release]
+lto = true