fix: properly handle already exists error in publish workflow

- Use grep to detect "already exists" error from cargo publish --dry-run
- Skip publishing when package version already exists on crates.io
- Continue workflow even when one package is already published
- This fixes the issue where existing packages block the entire release

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: wflixu

.github/workflows/release.yml

@@ -80,31 +80,39 @@ jobs:
         env:
           CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
         run: |
-          if cargo publish --dry-run -p mdz-rs; then
+          echo "Checking if mdz-rs ${{ steps.version.outputs.VERSION }} exists..."
+          if cargo publish --dry-run -p mdz-rs 2>&1 | grep -q "already exists"; then
+            echo "mdz-rs ${{ steps.version.outputs.VERSION }} already exists, skipping publish"
+          elif cargo publish --dry-run -p mdz-rs; then
             echo "Publishing mdz-rs to crates.io..."
             cargo publish -p mdz-rs
           else
-            echo "mdz-rs ${{ steps.version.outputs.VERSION }} already exists, skipping publish"
+            echo "Failed to check mdz-rs publish status"
+            exit 1
           fi
 
       - name: Wait for mdz-rs to be available
         run: |
-          if cargo publish --dry-run -p mdz-rs >/dev/null 2>&1; then
+          if cargo publish --dry-run -p mdz-rs 2>&1 | grep -q "already exists"; then
+            echo "mdz-rs version already exists, no need to wait"
+          else
             echo "New mdz-rs version published, waiting..."
             sleep 30
-          else
-            echo "mdz-rs version already exists, no need to wait"
           fi
 
       - name: Publish mdz to crates.io
         env:
           CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
         run: |
-          if cargo publish --dry-run -p mdz; then
+          echo "Checking if mdz ${{ steps.version.outputs.VERSION }} exists..."
+          if cargo publish --dry-run -p mdz 2>&1 | grep -q "already exists"; then
+            echo "mdz ${{ steps.version.outputs.VERSION }} already exists, skipping publish"
+          elif cargo publish --dry-run -p mdz; then
             echo "Publishing mdz to crates.io..."
             cargo publish -p mdz
           else
-            echo "mdz ${{ steps.version.outputs.VERSION }} already exists, skipping publish"
+            echo "Failed to check mdz publish status"
+            exit 1
           fi
 
   # 构建 GitHub Releases