DemocracyClub / yournextrepresentative / 1342a30a-fe72-409f-9f7a-48a8c6aded44

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internal/package: build image from Ubuntu base

This changes the approach to building the app image by using an Ubuntu
LTS release as the base, and starting by installing the current set of
packages explicitly referenced in deploy/vars.yml (modulo some outdated
entries such as redis-server).

This change is based on discussions with DC personnel with knowledge of
the current setup, and influenced by the likely path we'll take to
adopting a container-based production setup in the future.

The image that's produced is not small, as it contains many, many system
packages that are pulled in as dependencies of the package set we
explicitly specify. The resulting large package set does, however,
permit the app's base Python requirements to be installed successfully,
and this can act as a baseline for future size/efficiency improvements.

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