fix(slurmctld): correctly parse nested config

These changes modify the user supplied config parser so that
it correctly handles nested user supplied configuration values.

Accompanying test to show nested configuration is parsed correctly
in test_charm.py

Fixes #14

charms/slurmctld/src/charm.py

@@ -326,7 +326,7 @@ def _get_user_supplied_parameters(self) -> Dict[Any, Any]:
         user_supplied_parameters = {}
         if custom_config := self.config.get("slurm-conf-parameters"):
             user_supplied_parameters = {
-                line.split("=")[0]: line.split("=")[1]
+                line.split("=")[0]: line.split("=", 1)[1]
                 for line in str(custom_config).split("\n")
                 if not line.startswith("#") and line.strip() != ""
             }

charms/slurmctld/tests/unit/test_charm.py

@@ -171,3 +171,13 @@ def test_on_slurmdbd_unavailable(self) -> None:
         """Test that the on_slurmdbd_unavailable method works."""
         self.harness.charm._slurmdbd.on.slurmdbd_unavailable.emit()
         self.assertEqual(self.harness.charm._stored.slurmdbd_host, "")
+
+    def test_get_user_supplied_parameters(self) -> None:
+        """Test that user supplied parameters are parsed correctly."""
+        self.harness.update_config(
+            {"slurm-conf-parameters": "JobAcctGatherFrequency=task=30,network=40"}
+        )
+        self.assertEqual(
+            self.harness.charm._assemble_slurm_conf()["JobAcctGatherFrequency"],
+            "task=30,network=40",
+        )