docker driver: doesn't accept 'digest' tags

[justenwalker]

Nomad version

Nomad v0.7.1+ent (83ac1d7)

Operating system and Environment details

Linux ... 4.13.0-1014-azure #17-Ubuntu SMP Fri Apr 6 02:37:40 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Issue

the nomad docker driver does not allow digest tags to be used when running an image.
It will fail to recognize the @sha256:abcdef.... portion of the image and default to using latest

Reproduction steps

Run any job using the @sha256:... digest instead of a tag

For example: library/hello-world@sha256:f5233545e43561214ca4891fd1157e1c3c563316ed8e237750d59bde73361e77

[jippi]

isn't this duplicate of #4211 ? :)

[justenwalker]

Yeah, looks like it - sorry; I thought I scanned the issues to check if it was already reported. I guess 'digest' didn't include your issue :D

[github-actions]

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