Have Icedove built from Stretch with our patchset applied in Tails 3.0

Currently ISO images built from feature/stretch have Stretch’s Icedove. Obviously we don’t want to ship this in Tails 3.0. So at some point, if our patchset does not make it into Icedove before the freeze, we’ll need to install our custom packages.

Feature Branch: icedove:tails/stretch,tails:feature/11712-thunderbird

Related issues

Blocks #11973 (closed)
Blocks #11964 (closed)

Original created by @intrigeri on 11712 (Redmine)

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