Add an alpha channel upgrade path from 2.2.1 to 2.3.

wiki/src/upgrade/v1/Tails/2.2.1/i386/alpha/upgrades.yml

@@ -2,4 +2,19 @@
 build-target: i386
 channel: alpha
 product-name: Tails
-product-version: '2.2.1'
+product-version: 2.2.1
+upgrades:
+- details-url: https://tails.boum.org/news/version_2.3/
+  type: major
+  upgrade-paths:
+  - target-files:
+    - sha256: 3e62ab45a3e4105c8353a495f5774ce970f7c3b2736b420a5db7f7f79223b8ef
+      size: 1143314432
+      url: http://dl.amnesia.boum.org/tails/stable/tails-i386-2.3/tails-i386-2.3.iso
+    type: full
+  - target-files:
+    - sha256: bc99c573922b2a662ea94c02c1cf0c35a330a435338fc9a8580e0b28f03c2493
+      size: 271544320
+      url: http://dl.amnesia.boum.org/tails/stable/iuk/Tails_i386_2.2.1_to_2.3.iuk
+    type: incremental
+  version: '2.3'

wiki/src/upgrade/v1/Tails/2.2.1/i386/alpha/upgrades.yml.pgp

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