Add Nimbus version as an environment variable

[EridianAlpha]

[OisinKyne]

How about we set latest? Seems like a safe fallback to have

On Thu, Mar 23, 2023 at 9:27 PM Eridian @.***> wrote:

@.**** commented on this pull request.

In nimbus/Dockerfile https://github.com/ObolNetwork/charon-distributed-validator-cluster/pull/116#discussion_r1146881499 :

@@ -1,6 +1,8 @@ -FROM statusim/nimbus-eth2:multiarch-v23.3.1 as nimbusbn +ARG NIMBUS_VERSION

Yes this can have a default set, and it will be overwritten with anything that's passed through. Does this add to a maintenance overhead/ cause duplication though, as a default value is already being set in the docker-compose.yml file on line 199?

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-- Oisín Kyne

[EridianAlpha]

@OisinKyne I've added "latest" and confirmed that it works.