ci(build): simplify boot image copying in workflow

Remove redundant directory navigation and explicitly copy required boot images instead of using wildcard pattern. This makes the workflow more reliable and easier to maintain.

.github/workflows/build.yml

@@ -428,12 +428,10 @@ jobs:
         run: |
           mkdir bootimgs
 
-          cd $CONFIG/common/out/arch/arm64/boot/
-          ls -a
-          cd ../$CONFIG
-
           echo "Creating bootimgs folder and copying images..."
-          cp $CONFIG/common/out/arch/arm64/boot/Image* ./bootimgs
+          cp $CONFIG/common/out/arch/arm64/boot/Image ./bootimgs
+          cp $CONFIG/common/out/arch/arm64/boot/Image.gz ./bootimgs
+          cp $CONFIG/common/out/arch/arm64/boot/Image.lz4 ./bootimgs
 
       - name: Android 12 boot image build script
         if: ${{ inputs.android_version == 'android12' }}