devops: do cache busting for APT (#2656)
devops: do cache busting for APT (#2656)

To avoid caching old package lists, every `apt-get install`
should be prefixed with `apt-get update`.

More info on the matter:
- https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#apt-get
- https://github.com/moby/moby/issues/3313
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