Update upgrade-description files.

wiki/src/upgrade/v1/Tails/1.2.3/i386/alpha/upgrades.yml

@@ -3,3 +3,18 @@ build-target: i386
 channel: alpha
 product-name: Tails
 product-version: 1.2.3
+upgrades:
+- details-url: https://tails.boum.org/news/test_1.3-rc1/
+  type: major
+  upgrade-paths:
+  - target-files:
+    - sha256: 40b2f1e2564ed15e003a3fb073e770415f6b6f855085f23a5b44fba47a258bbf
+      size: 954132480
+      url: http://dl.amnesia.boum.org/tails/alpha/tails-i386-1.3~rc1/tails-i386-1.3~rc1.iso
+    type: full
+  - target-files:
+    - sha256: 82cdfbd18f0e350001a191d05360317d398090d1acaa5157a0e0202c62f794f2
+      size: 184698880
+      url: http://dl.amnesia.boum.org/tails/alpha/iuk/Tails_i386_1.2.3_to_1.3~rc1.iuk
+    type: incremental
+  version: 1.3~rc1

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