fix: stable release時にnext dist-tagを自動同期

.github/workflows/auto-tag.yml

@@ -52,12 +52,47 @@ jobs:
         run: |
           VERSION="${{ needs.tag.outputs.tag }}"
           VERSION="${VERSION#v}"
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
           if echo "$VERSION" | grep -qE '(alpha|beta|rc|next)'; then
             echo "tag=next" >> "$GITHUB_OUTPUT"
           else
             echo "tag=latest" >> "$GITHUB_OUTPUT"
           fi
 
-      - run: npm publish --tag ${{ steps.npm-tag.outputs.tag }}
+      - name: Publish package
+        run: npm publish --tag ${{ steps.npm-tag.outputs.tag }}
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Sync next tag on stable release
+        if: steps.npm-tag.outputs.tag == 'latest'
+        run: |
+          PACKAGE_NAME=$(node -p "require('./package.json').name")
+          VERSION="${{ steps.npm-tag.outputs.version }}"
+
+          for attempt in 1 2 3; do
+            if npm dist-tag add "${PACKAGE_NAME}@${VERSION}" next; then
+              exit 0
+            fi
+            if [ "$attempt" -eq 3 ]; then
+              echo "Failed to sync next tag after 3 attempts."
+              exit 1
+            fi
+            sleep $((attempt * 5))
+          done
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Verify dist-tags
+        run: |
+          PACKAGE_NAME=$(node -p "require('./package.json').name")
+          LATEST=$(npm view "${PACKAGE_NAME}" dist-tags.latest)
+          NEXT=$(npm view "${PACKAGE_NAME}" dist-tags.next || true)
+
+          echo "latest=${LATEST}"
+          echo "next=${NEXT}"
+
+          if [ "${{ steps.npm-tag.outputs.tag }}" = "latest" ] && [ "${LATEST}" != "${NEXT}" ]; then
+            echo "Expected next to match latest on stable release, but they differ."
+            exit 1
+          fi