added gitignore for result for nix

tried to build the nix
fixed it as well

crates/cli/build.rs

@@ -0,0 +1,17 @@
+use std::process::Command;
+
+fn main() {
+    let git_version = if let Ok(v) = std::env::var("CARGO_ENV_GIT_VERSION") {
+        v
+    } else {
+        Command::new("git")
+            .args(["describe", "--always", "--dirty"])
+            .output()
+            .map(|output| String::from_utf8_lossy(&output.stdout).trim().to_string())
+            .unwrap_or_else(|_| "unknown".to_string())
+    };
+
+    println!("cargo:rustc-env=GIT_VERSION={}", git_version);
+
+    println!("cargo:rerun-if-changed=.git/HEAD");
+}