Update GDASApp to spack-stack/1.8

[RussTreadon-NOAA]

EIB informed the DA group that spack-stack/1.8 will be released soon. GDASApp modulefiles currently use spack-stack/1.6. This issue is opened to document the updating of GDASApp modulefiles to spack-stack/1.8.

[RussTreadon-NOAA]

@DavidHuber-NOAA , do you know if we have spack-stack (any version) installed on Acorn?

We use spack-stack to build GDASApp on NOAA RDHPCS. It would be nice to use spack-stack for the WCOSS2 GDASApp build. I don't think spack-stack can be installed on Cactus or Dogwood yet (can it?). spack-stack may, however, already be on Acorn. Is this the case? If so, where can I find spack-stack on Acorn?

[DavidHuber-NOAA]

@RussTreadon-NOAA Yes, spack-stack 1.4.0-1.8.0 are available on Acorn. The installations are under /lfs/h1/emc/nceplibs/noscrub/spack-stack/spack-stack-<version>/envs/<environment name>/install/modulefiles/Core.

As for Cactus and Dogwood, it looks like those systems will have spack-stack installed and supported fairly soon. I will be meeting with Steven, Hang, Alex, et al. this week to go over details, so stay tuned.

[RussTreadon-NOAA]

Thank you @DavidHuber-NOAA . This is great news. Let me try to build GDASApp on Acorn using spack-stack. If this works, we're ready when spack-stack is available on WCOSS2.

[RussTreadon-NOAA]

FYI @DavidHuber-NOAA , I was able to create an acorn.intel.lua using spack-stack/1.6.0 to build GDASApp on Acorn. I chose spack-stack/1.6.0 because this is what we use on NOAA RHDPCS machines. acorn.intel.lua was committed to GDASApp branch feature/build at f3fe406. I'll run some tests on Acorn once the queues are opened to developers.

Hopefully updating to spack-stack/1.8.0 is relatively straight forward. It would be great to see spack-stack on WCOSS2 sometime this fall.