fix(valgrind): install libc6-dbg during valgrind setup

GitHub runners do not ship libc debug symbols by default, which leads
to unresolved symbols in exec CLI simulation benchmarks. Install
libc6-dbg via apt on supported systems after installing valgrind.

Fixes COD-2770

Author: not-matthias

src/executor/valgrind/setup.rs

@@ -199,7 +199,13 @@ pub async fn install_valgrind(
             Ok(vec!["valgrind".to_string()])
         },
     )
-    .await
+    .await?;
+
+    // Install libc debug symbols, as Github runners by default do not
+    // include them. Only install for supported systems.
+    apt::install(system_info, &["libc6-dbg"])?;
+
+    Ok(())
 }
 
 #[cfg(test)]