Update spack/README.

Author: nkoukpaizan

buildsystem/spack/README.md

@@ -22,11 +22,15 @@ any existing installations unusable due to changes in the hashing algorithm.
 
 ## Using the automatic pipelines in GitLab PRs
 
-Spack modules are automatically rebuilt via CI pipelines for a cluster when a commit message includes `[<clustername>-rebuild]` where `<clustername>` is one of the following [newell, deception, ascent].
+There are currently no clusters supporting automatic builds via CI pipelines.
 
-See the [developer guidelines](../../docs/developer_guidelines.md) for a general workflow outline.
+Spack modules could be automatically rebuilt via CI pipelines for a cluster when a commit message 
+includes `[<clustername>-rebuild]`. See the [developer guidelines](../../docs/developer_guidelines.md) 
+for a general workflow outline. Once a build is finished, a new commit is pushed to the branch 
+with a commit message with `[<clustername>-test]`, where tests are run only for that platform. 
+If you want all of CI to be re-run after a specific platform test, you may have to push another 
+empty commit, or re-run CI manually.
 
-Once a build is finished, a new commit is pushed to the branch with a commit message with `[<clustername>-test]`, where tests are run only for that platform. If you want all of CI to be re-run after a specific platform test, you may have to push another empty commit, or re-run CI manually.
 ## General Workflow
 
 Run scripts in the following order to install using spack for a supported platform.
@@ -124,7 +128,7 @@ in `configure_modules.sh` that aligns with that is specified in the environment.
 These modules are used in `buildsystem/<build_type>/` in various scripts for each
 platform, and you should ensure these are compatible with the module configuration
 used for each platform. Make sure to create variable files that are consistent
-with examples for `gcc-cuda/newell` and `clang-hip/frontier`.
+with examples for `clang-hip/frontier`.
 
 If you have an update in the ExaGO/HiOp spack package, you might need to update
 the relevant `spack.yaml` and configure module scripts for each platform.