Add oven-sh/setup-bun to GitHub CI when generating an app with bun

Author: tangrufus

railties/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Use `oven-sh/setup-bun` in GitHub CI when generating an app with bun
+
+    *TangRufus*
+
 *   Disable `pidfile` generation in production environment.
 
     *Hans Schnedlitz*

railties/lib/rails/generators/rails/app/templates/github/ci.yml.tt

@@ -109,6 +109,12 @@ jobs:
         with:
           ruby-version: .ruby-version
           bundler-cache: true
+      <%- if using_bun? -%>
+
+      - uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: <%= dockerfile_bun_version %>
+      <%- end -%>
 
       - name: Run tests
         env: