Add Override The Default Yarn Version as a netlify til

README.md

@@ -9,7 +9,7 @@ and pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_965 TILs and counting..._
+_966 TILs and counting..._
 
 ---
 
@@ -32,6 +32,7 @@ _965 TILs and counting..._
 * [Mac](#mac)
 * [MongoDB](#mongodb)
 * [MySQL](#mysql)
+* [Netlify](#netlify)
 * [Next.js](#nextjs)
 * [Phoenix](#phoenix)
 * [PostgreSQL](#postgresql)
@@ -426,6 +427,10 @@ _965 TILs and counting..._
 - [Show Tables That Match A Pattern](mysql/show-tables-that-match-a-pattern.md)
 - [Show Indexes For A Table](mysql/show-indexes-for-a-table.md)
 
+### Netlify
+
+- [Override The Default Yarn Version](netlify/override-the-default-yarn-version.md)
+
 ### Next.js
 
 - [Define URL Redirects In The Next Config](nextjs/define-url-redirects-in-the-next-config.md)

netlify/override-the-default-yarn-version.md

@@ -0,0 +1,11 @@
+# Override The Default Yarn Version
+
+When you first deploy an app to [Netlify](https://www.netlify.com/), the
+current default [Yarn](https://yarnpkg.com/) version will be locked in. This
+Yarn version will be used for future builds and deployments.
+
+You can override the default Yarn version by including the `YARN_VERSION`
+environment variable. Set it to the desired major and minor version in the app
+settings panel. The next deployment will use that new version.
+
+[source](https://community.netlify.com/t/default-yarn-version-is-now-1-17/2297)