ci: add build instructions

src/build.rs

@@ -0,0 +1,15 @@
+/*
+    SPDX-License-Identifier: AGPL-3.0-or-later
+    Copyright (C) 2025 Erick Ahmed
+*/
+
+fn main() {
+    cc::Build::new()
+        .cpp(true)
+        .file("src/occt/point.cpp")
+        .include("src/occt/include")
+        .compile("point");
+
+    println!("cargo:rerun-if-changed=src/occt/point.cpp");
+    println!("cargo:rerun-if-changed=src/occt/include/point.hpp");
+}