Add a "mini" build profile

It's like release, but with LTO and LLVM's `-Oz` size optimization.

Cargo.toml

@@ -27,6 +27,14 @@ opt-level = 3
 # codegen-units = 1
 lto = "fat"
 
+[profile.mini]
+inherits = "release"
+lto = true
+opt-level = "z"
+codegen-units = 1
+strip = "symbols"
+panic = "abort"
+
 [profile.wasm-release]
 inherits = "release"
 opt-level = "z"