ci: update build docker & remove compress

Signed-off-by: Han Gao <gaohan@iscas.ac.cn>

Author: RevySR

.github/workflows/kernel.yml

@@ -23,7 +23,7 @@ jobs:
           - name: native
             cross: riscv64-linux-gnu-
             machine: [ self-hosted, Linux, riscv64 ]
-            run_image: ghcr.io/revyos/revyos-kernel-builder:riscv64-2025.05.20-plucky
+            run_image: ghcr.io/revyos/revyos-kernel-builder:riscv64-2025.12.04-plucky
             compiler: riscv64-linux-gnu-gcc-14
 
     runs-on: ${{ matrix.machine }}
@@ -56,12 +56,9 @@ jobs:
                 sudo cp -v kernel-commitid ${GITHUB_WORKSPACE}/output
               popd
 
-      - name: compress
-        run: tar -zcvf th1520-kernel-${{ matrix.name }}.tar.gz output
-
       - name: 'Upload Artifact'
         uses: actions/upload-artifact@v4
         with:
           name: th1520-kernel-${{ matrix.name }}
-          path: th1520-kernel-${{ matrix.name }}.tar.gz
+          path: output/*
           retention-days: 30