Update build_linux.yaml

.gitea/workflows/build_linux.yaml

@@ -29,6 +29,20 @@ jobs:
             -G Ninja \
             -DCMAKE_BUILD_TYPE=Release
 
+      - name: Debug Nix linker environment
+        run: |
+          nix develop --command bash -c '
+            echo "CC=$CC"
+            echo "CXX=$CXX"
+            echo "LD=$LD"
+            echo
+            echo "NIX_LDFLAGS:"
+            printf "%s\n" "$NIX_LDFLAGS"
+            echo
+            echo "NIX_CFLAGS_LINK:"
+            printf "%s\n" "$NIX_CFLAGS_LINK"
+          '
+
       - name: Build
         run: |
           nix develop --command cmake --build build \