ci: extract tag logic in publish workflow

Author: uhyo

.github/workflows/publish.yml

@@ -28,7 +28,19 @@ jobs:
       - name: Build
         run: npm run build
 
+      - name: Determine npm tag
+        id: npm-tag
+        run: |
+          VERSION=$(node -p "require('./package.json').version")
+          if [[ "$VERSION" == *"-"* ]]; then
+            # Prerelease version - extract tag (e.g., "alpha" from "0.0.1-alpha.0")
+            TAG=$(echo "$VERSION" | sed 's/.*-\([a-zA-Z]*\).*/\1/')
+            echo "tag=$TAG" >> $GITHUB_OUTPUT
+          else
+            echo "tag=latest" >> $GITHUB_OUTPUT
+          fi
+
       - name: Publish
-        run: npm publish --provenance --access public
+        run: npm publish --provenance --access public --tag ${{ steps.npm-tag.outputs.tag }}
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}