Rebootstrap (#3604)

This pulls in the new prompt from
#3577 so we can try it out
internally

Author: lihaoyi

.config/mill-version

@@ -1 +1 @@
-0.12.0-RC2-17-07e173
+0.12.0-RC2-38-029986

build.mill

@@ -20,7 +20,8 @@ import mill.define.Cross
 import $meta._
 import $file.ci.shared
 import $file.ci.upload
-//import $packages._
+import $packages._
+
 object Settings {
   val pomOrg = "com.lihaoyi"
   val githubOrg = "com-lihaoyi"

ci/mill-bootstrap.patch

@@ -1,11 +0,0 @@
-diff --git a/build.mill b/build.mill
-index a4039a6288..c8a686e492 100644
---- a/build.mill
-+++ b/build.mill
-@@ -18,6 +18,7 @@ import mill.define.Cross
-
- // plugins and dependencies
- import $meta._
-+import $packages._
- import $file.ci.shared
- import $file.ci.upload