cargo: set profile.release settings

Author: devmatteini

Cargo.toml

@@ -3,7 +3,10 @@ name = "dag"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[profile.release]
+opt-level = "s"
+lto = true
+codegen-units = 1
 
 [dependencies]
 ureq = { version = "2.3.1", features = ["json"] }