Builtin-toolchain prefix for debug

src/dds/toolchain/toolchain.cpp

 
     std::string tc_content;
 
+    if (starts_with(tc_id, "debug:")) {
+        tc_id = tc_id.substr("debug:"sv.length());
+        tc_content += "Debug: True\n";
+    }
+
     if (starts_with(tc_id, "ccache:")) {
         tc_id = tc_id.substr("ccache:"sv.length());
         tc_content += "Compiler-Launcher: ccache\n";