try upload-artifact v3

.gitea/workflows/build-kernel.yaml

@@ -23,15 +23,23 @@ jobs:
             ca-certificates
           curl -L https://nixos.org/nix/install | sh -s -- --daemon
 
-      - name: Build custom kernel
+      # - name: Build custom kernel
+      #   run: |
+      #     export NIX_BUILD_CORES=0
+      #     nix-build '<nixpkgs/nixos>' -A config.system.build.kernel --arg configuration ./custom-kernel.nix
+      #   env:
+      #     PATH: /nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:/bin:/sbin:/usr/bin:/usr/sbin
+      
+      - name: Create dummy files
         run: |
-          export NIX_BUILD_CORES=0
-          nix-build '<nixpkgs/nixos>' -A config.system.build.kernel --arg configuration ./custom-kernel.nix
-        env:
-          PATH: /nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:/bin:/sbin:/usr/bin:/usr/sbin
+          mkdir -p ./result
+          echo "This is a dummy file" > ./result/dummy-file.txt
+
+      - name: Zip kernel artifacts
+        run: zip -r custom-kernel.zip ./result
 
       - name: Upload kernel artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: custom-kernel
-          path: ./result
+          path: ./custom-kernel.zip