boards/kakute-f7-mini-v3: simple led demo for board testing

Signed-off-by: Onur Özkan <work@onurozkan.dev>

boards/kakute-f7-mini-v3/build.rs

@@ -1,3 +1,10 @@
 fn main() {
     kaptan_spec::validate_package();
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=memory.x");
+    println!("cargo:rustc-link-arg=-Tlink.x");
+    println!(
+        "cargo:rustc-link-search={}",
+        std::env::var("CARGO_MANIFEST_DIR").expect("Cargo must set CARGO_MANIFEST_DIR")
+    );
 }