Enable Bletchley in Jenkins.

[Andrew Geissler]

> On Dec 16, 2021, at 11:36 AM, Patrick Williams <patrick at stwcx.xyz> wrote:
> 
> Andrew,
> 
> Can we get the machine 'bletchley' enabled in CI?  Facebook is doing some fairly
> active development on it and I'd like to keep tabs on build regressions.  We
> currently contribute 4 cloud instances to the Jenkins pool and have 3 machine
> types.  Let me know if we need to enable any additional compute resources.

Seems reasonable to me, I added bletchley to CI.

> 
> -- 
> Patrick Williams