Add SLURM gres extraction from resources

src/glicid_spawner/slurm.py

@@ -181,3 +181,15 @@ def sinfo_from_file(fname, with_states=('idle', 'mixed')) -> dict:
 def sinfo(username: str = None, with_states=('idle', 'mixed')) -> dict:
     """SLURM SINFO resources available for a given user."""
     return sinfo_filter(sinfo_reader(sinfo_run(username=username)), with_states=with_states)
+
+
+def gres(resources: dict) -> list:
+    """List SLURM GPU resources."""
+    return sorted(
+        {
+            node.gpu.name
+            for cluster in resources.values()
+            for partition in cluster
+            for node in partition
+        }
+    )