Use a compute-optimized VM for Linux builds

[cevich]

Previously, the Linux build tasks made use of standard-issue custom-cpu/mem VMs with a completion time of around 10-15min. Attempt to significantly improve this by utilizing (on paper) faster, compute-optimized VMs w/ additional cores. Since golang compilation is highly parallelized, the additional cores also benefit the build time (in addition to increased speed).

Ref: https://cloud.google.com/compute/docs/compute-optimized-machines

Does this PR introduce a user-facing change?

None

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[packit-as-a-service[bot]]

Ephemeral COPR build failed. @containers/packit-build please check.

[cevich]

:cry:

"message": "Operation denied by custom org policy: [customConstraints/custom.denyMachineTypes] : This organization policy prevents creating instances with exotic machine types. Contact the IT Public Cloud team at help.redhat.com for an exception",