Add this week in Databend 21

PsiACE · web-flow · commit c93bedb7d2fe · 2021-12-23T02:35:00.000+08:00
diff --git a/draft/2021-12-22-this-week-in-rust.md b/draft/2021-12-22-this-week-in-rust.md
@@ -22,6 +22,8 @@ If you find any errors in this week's issue, [please submit a PR](https://github
 
 ### Project/Tooling Updates
 
+* [This week in Databend #21: an elastic and reliable cloud warehouse](https://weekly.databend.rs/2021-12-22-databend-weekly/)
+
 ### Observations/Thoughts
 
 ### Rust Walkthroughs
