CI: upload debug log

Signed-off-by: Tianling Shen <[email protected]>

.github/workflows/update-mirror.yml

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 #
-# Copyright (C) 2021 ImmortalWrt.org
+# Copyright (C) 2021-2023 ImmortalWrt.org
 
 name: Update Mirror
 
@@ -50,10 +50,19 @@ jobs:
         run: |
           cd "immortalwrt"
           echo -e "CONFIG_ALL=y" > ".config"
+          echo -e "CONFIG_DEVEL=y" >> ".config"
+          echo -e "CONFIG_BUILD_LOG=y" >> ".config"
           make defconfig
           make download -j8
           find dl -size -1024c -exec rm -f {} \;
 
+      - name: Upload failogs
+        if: ${{ failure() || cancelled() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ matrix.branch }}-logs
+          path: logs/
+
       - name: Fetch Cached Uploaded Files List
         uses: actions/cache@v3
         with: