packaging: Add dmidecode as a Suggested / Recommended package to Nomad's Linux packaging manifest.

[shoenig]

Add dmidecode as a Suggested / Recommended package to Nomad's Linux packaging manifest.

Nomad 1.7 and later relies on the dmidecode command being available particularly in virtualized environments like Amazon EC2 for the detection of CPU performance data.

Not having this as part of the Linux packaging creates a bad UX for first starting up a Nomad 1.7 agent in these environments, e.g.

https://github.com/hashicorp/nomad/issues/19343 https://github.com/hashicorp/nomad/issues/19371

[apollo13]

I'd recommend (pun intended) to put it into the recommended section and not suggested. Recommended is usually (not always though) installed by default whereas suggested is usually not installed and also not seen by the user. Then again if this is only required for virtualized systems it might not make sense to install by default but solely error out in the nomad agent and as such communicating the problem clearly to the user. On the other hand I'd imagine virtual machines are probably more common than bare metal nowadays for nomad, so it still might make sense to install dmidecode by default via a dependency.

[ahjohannessen]

Flatcar Linux does not seem to have dmidecode - Fedora CoreOS can get it via rpm-ostree. Wonder how I should go about this with my Flatcar machines.

[MorphBonehunter]

I'm not convinced that installing dmidecode should be adviced as this could lead to suboptimal MHz readings (#19468) in virtual machine environments. So that's maybe also a point to rethink reopening #18213.

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