Update Buildkite pipeline for the new JuliaGPU cluster (#1234)

* Update Buildkite pipeline for the new JuliaGPU cluster.

Switch to the per-backend queues of the new JuliaGPU cluster.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Move the Metal job(s) to the new metal queue.

The JuliaGPU cluster now has a macOS agent with an Apple Silicon GPU,
so Metal jobs no longer need a separate pipeline on the ecosystem
cluster.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Erik Faulhaber <44124897+efaulhaber@users.noreply.github.com>

Author: 3 people

.buildkite/pipeline.yml

@@ -4,8 +4,7 @@ steps:
       - JuliaCI/julia#v1:
           version: "1.12"
     agents:
-      queue: "juliagpu"
-      cuda: "*"
+      queue: "cuda"
     command: |
       julia --color=yes --project=test -e 'using Pkg; Pkg.add("CUDA"); Pkg.develop(path="."); Pkg.instantiate()'
       julia --color=yes --project=test -e 'include("test/runtests.jl")'
@@ -18,41 +17,37 @@ steps:
       - JuliaCI/julia#v1:
           version: "1.12"
     agents:
-      queue: "juliagpu"
-      rocm: "*"
+      queue: "rocm"
     command: |
       julia --color=yes --project=test -e 'using Pkg; Pkg.add("AMDGPU"); Pkg.develop(path="."); Pkg.instantiate()'
       julia --color=yes --project=test -e 'include("test/runtests.jl")'
     env:
       TRIXIPARTICLES_TEST: amdgpu
     timeout_in_minutes: 60
 
-  - label: "Metal"
-    plugins:
-      - JuliaCI/julia#v1:
-          version: "1.12"
-    agents:
-      queue: "juliaecosystem"
-      os: "macos"
-      arch: "aarch64"
-    command: |
-      julia --color=yes --project=test -e 'using Pkg; Pkg.add("Metal"); Pkg.develop(path="."); Pkg.instantiate()'
-      julia --color=yes --project=test -e 'include("test/runtests.jl")'
-    env:
-      TRIXIPARTICLES_TEST: metal
-    timeout_in_minutes: 60
-
   # Doesn't work. Fails with segfault. See https://github.com/trixi-framework/TrixiParticles.jl/issues/484.
   # - label: "oneAPI"
   #   plugins:
   #     - JuliaCI/julia#v1:
   #         version: "1"
   #   agents:
-  #     queue: "juliagpu"
-  #     intel: "*"
+  #     queue: "oneapi"
   #   command: |
   #     julia --color=yes --project=test -e 'using Pkg; Pkg.add("oneAPI"); Pkg.develop(path="."); Pkg.instantiate()'
   #     julia --color=yes --project=test -e 'include("test/runtests.jl")'
   #   env:
   #     TRIXIPARTICLES_TEST: oneapi
   #   timeout_in_minutes: 60
+
+  - label: "Metal"
+    plugins:
+      - JuliaCI/julia#v1:
+          version: "1.12"
+    agents:
+      queue: "metal"
+    command: |
+      julia --color=yes --project=test -e 'using Pkg; Pkg.add("Metal"); Pkg.develop(path="."); Pkg.instantiate()'
+      julia --color=yes --project=test -e 'include("test/runtests.jl")'
+    env:
+      TRIXIPARTICLES_TEST: metal
+    timeout_in_minutes: 60