feat: update default image to ghcr.io one

[chenrui333]

Description

per Atlantis 0.17.1 release, the default image registry is ghcr.io. Thus updating the code to reflect that.

[antonbabenko]

Thanks @chenrui333 !

v3.1.0 has been just released.

[chenrui333]

Thanks @antonbabenko!

[bryantbiggs]

FYI - I don't think this change does what you think it does. if we wanted to change the image repo, we should have changed the image version to be dev per the directions of upstream Atlantis repo

terraform-aws-atlantis/variables.tf

Line 470 in 179b846

default = "latest"

[bryantbiggs]

also, they are still publishing to Dockerhub as well so the "old" route still works

[github-actions]

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