Detect cycle automatically in update_config script

Description

It's rather annoying to require both cycle and proposal as input for update_config manually. This MR adds auto detection of cycle of omitted by looking up the proposal's path on GPFS.

How Has This Been Tested?

Unit tests.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the code style of this project.
• I added tests where appropriate.

Reviewers

@kluyvert

tests/test_update_config.py

@@ -9,6 +9,7 @@ import yaml
 import zmq
 
 from webservice.update_config import (
+    _find_cycle,
     _add_available_configs_to_arg_parser,
     _create_new_config_from_args_input,
     main,
@@ -174,3 +175,19 @@ def test_create_new_config_from_args_input(instrument, args, expected):
         available_conf=EXPECTED_CONF,
     )
     assert new_conf == expected
+
+
+def test_find_cycle(tmp_path):
+    proposal_path = tmp_path / 'CALLAB' / '202301' / 'p002003'
+    proposal_path.mkdir(parents=True, exist_ok=True)
+
+    assert _find_cycle('2003', tmp_path) == '202301'
+    assert _find_cycle('002003', tmp_path) == '202301'
+
+    with pytest.raises(ValueError):
+        # Not existing proposal.
+        _find_cycle('2004')
+
+    with pytest.raises(ValueError):
+        # Not a number.
+        _find_cycle('p2004')