Add initial `spack.yaml` and `config` #19

Job	Run time
Closed	0s
Comment	0s
CI / Set Defaults	1s
CI / Check Config Fields	8s
CI / Check spack.yaml	5s
CI / Get Version and Tag Prerelease	2s
CI / Notifier	3s
CI / Deploy to Prerelease / Setup Spack Environment	1s
CI / Deploy to Prerelease / Setup Deployment Environment	4s
CI / Deploy to Prerelease / Deployment (Gadi Prerelease) / Deploy to Gadi Prerelease	1m 5s
CI / Deploy to Prerelease / Deployment (Gadi Prerelease) / Create Release	0s
CI / Deploy to Prerelease / Deployment (Gadi Prerelease) / Build DB Metadata Upload	0s
	1m 29s

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