fix(ci): fix release job losing build artifacts

Two bugs introduced in 0254b74 caused releases to have no usable apps:
1. actions/checkout@v6 does not exist — changed to @v4
2. Checkout step ran after packaging, and git clean (default) deleted
   the zip files before the release step could upload them.

Moved checkout+changelog before download-artifact so packaging
happens after checkout and zips survive until the release step.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: JusterZhu

.github/workflows/publish.yml

@@ -76,24 +76,8 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/download-artifact@v4
-
-      - name: Get timestamp
-        id: ts
-        run: echo "timestamp=$(date -u '+%Y%m%d%H%M%S')" >> $GITHUB_OUTPUT
-
-      - name: Package win
-        working-directory: win-x64
-        run: zip ../GeneralUpdate.Tools_${{ steps.ts.outputs.timestamp }}_win-x64.zip -r *
-
-      - name: Package linux
-        working-directory: linux-x64
-        run: |
-          chmod +x *
-          zip ../GeneralUpdate.Tools_${{ steps.ts.outputs.timestamp }}_linux-x64.zip -r *
-
       - name: Checkout for changelog
-        uses: actions/checkout@v6
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -144,6 +128,22 @@ jobs:
           echo "=== Generated changelog ==="
           cat changelog.md
 
+      - uses: actions/download-artifact@v4
+
+      - name: Get timestamp
+        id: ts
+        run: echo "timestamp=$(date -u '+%Y%m%d%H%M%S')" >> $GITHUB_OUTPUT
+
+      - name: Package win
+        working-directory: win-x64
+        run: zip ../GeneralUpdate.Tools_${{ steps.ts.outputs.timestamp }}_win-x64.zip -r *
+
+      - name: Package linux
+        working-directory: linux-x64
+        run: |
+          chmod +x *
+          zip ../GeneralUpdate.Tools_${{ steps.ts.outputs.timestamp }}_linux-x64.zip -r *
+
       - name: Create Release
         uses: softprops/action-gh-release@v2
         with: