ebpf: set opt-level = 2

Pretty much all non trivial programs need at least opt-level=2 to
compile and link successfully

{{project-name}}-ebpf/Cargo.toml

@@ -13,6 +13,7 @@ path = "src/main.rs"
 
 [profile.dev]
 panic = "abort"
+opt-level = 2
 overflow-checks = false
 
 [profile.release]