ci: use repo variable for changelog link (#1246)

Author: azat-io

.github/workflows/release.yml

@@ -27,4 +27,4 @@ jobs:
         with:
           tag_name: ${{ github.ref }}
           body: |
-            Please refer to [CHANGELOG.md](https://github.com/vuepress/vuepress-next/blob/main/CHANGELOG.md) for details.
+            Please refer to [CHANGELOG.md](https://github.com/${{ github.repository }}/blob/main/CHANGELOG.md) for details.