Update build_linux.yaml

.gitea/workflows/build_linux.yaml

@@ -87,6 +87,27 @@ jobs:
             --preset release \
             --parallel
 
+      - name: Debug Vulkan headers
+        run: |
+          echo "=== CMake FetchContent ==="
+          find bin/release/_deps -maxdepth 3 -type f \
+            \( -name vulkan_core.h -o -name vk_enum_string_helper.h \) \
+            -print
+
+          echo
+          echo "=== System Vulkan ==="
+          find /usr/include/vulkan -maxdepth 1 -type f \
+            -name '*.h' -print | head -20
+
+          echo
+          echo "=== Header versions ==="
+          grep -R \
+            -E 'VK_HEADER_VERSION(_COMPLETE)?' \
+            bin/release/_deps 2>/dev/null | head -20 || true
+
+          grep -E 'VK_HEADER_VERSION(_COMPLETE)?' \
+            /usr/include/vulkan/vulkan_core.h
+
       - name: Check Vulkan versions
         run: |
           echo "System:"