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Improve Decision image generation

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@ahal 已经在做这个了。

开始于 2023年6月22日。

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描述

I'd like to solidify the Decision image generation, making it more robust and reproducible. Namely:

  1. Change the base from Ubuntu 20.04 to Debian 12.
  2. Adopt package tasks (as seen in Gecko), so we can explicitly specify versions of certain tools (like Mercurial).
  3. Provide a base layer below the Decision image so we don't update the world everytime it is re-generated.

I think we'll likely end up with something similar to what Gecko has, where there is:

  1. A debian-raw image that contains some bare-bones setup to add apt-sources from Taskcluster
  2. A debian-packages image which is only used by the packages tasks.
  3. packages tasks to pin specific versions of various tools needed (possibly just Mercurial to start)
  4. A debian-base image that depends on debian-raw + the packages task, and sets up packages + other debian packages needed.
  5. A decision image that sits on top of debian-base and only layers on Taskgraph itself.

I consider this work to be a pre-requisite to #46 as it will allow us to update only Taskgraph in the image, leaving everything else identical. This should make Decision images much more robust and reproducible. The debian-base image can also be re-used for other tasks or projects.

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