Uses a prebuilt obscuro node image #1487
Merged
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Why this change is needed
https://github.com/obscuronet/obscuro-internal/issues/1449
Improves the deploy time by having a pre-built image instead of installing everything on the fly.
Should also reduce install-time flakyness, like errors on apt-get update / docker install, that we have seen in the past.
What changes were made as part of this PR
Defaults to using the ObscuroConfUbuntu image
Added a text file on how to create these images for future reference.
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