feat: add nightly ci gpu hpc

Author: Oisin-M

.github/ci-hpc-gpu-config.yml

@@ -0,0 +1,5 @@
+build:
+  python_dependencies:
+  - ecmwf/earthkit-utils@refactor/backend_for_testing_only
+  queue: ng
+  gpus: 1

.github/workflows/nightly-hpc-gpu.yml

@@ -0,0 +1,22 @@
+name: nightly-hpc-gpu
+
+on:
+  workflow_dispatch:
+
+  # Run at 03:20 UTC every day (on default branch)
+  schedule:
+  - cron: "20 03 * * *"
+
+jobs:
+  test-hpc-gpu:
+    runs-on: [self-hosted, linux, hpc]
+    steps:
+    - uses: ecmwf/reusable-workflows/ci-hpc@v2
+      with:
+        github_user: ${{ secrets.BUILD_PACKAGE_HPC_GITHUB_USER }}
+        github_token: ${{ secrets.GH_REPO_READ_TOKEN }}
+        troika_user: ${{ secrets.HPC_CI_TESTING_SSH_USER }}
+        repository: ecmwf/earthkit-meteo@${{ github.event.pull_request.head.sha || github.sha }}
+        build_config: .github/ci-hpc-gpu-config.yml
+        python_version: "3.10"
+        python_toml_opt_dep_sections: gpu,test

pyproject.toml

@@ -31,6 +31,10 @@ dependencies = [
   "earthkit-utils>=0.0.1",
   "numpy",
 ]
+optional-dependencies.gpu = [
+  "cupy",
+  "torch",
+]
 optional-dependencies.test = [
   "pytest",
   "pytest-cov",