Make stateless lister constructors compatible with credentials

In effect, it just allows to add credentials to cgit, cran and pypi listers.

This fixes instances of error [1]

[1] https://sentry.softwareheritage.org/share/issue/2c35a9f129cf4982a2dd003a232d507a/

Related to T2998

swh/lister/cran/lister.py

@@ -10,7 +10,7 @@ from typing import Dict, Iterator, List, Optional, Tuple
 
 import pkg_resources
 
-from swh.lister.pattern import StatelessLister
+from swh.lister.pattern import CredentialsType, StatelessLister
 from swh.scheduler.interface import SchedulerInterface
 from swh.scheduler.model import ListedOrigin
 
@@ -29,9 +29,13 @@ class CRANLister(StatelessLister[PageType]):
     LISTER_NAME = "CRAN"
 
     def __init__(
-        self, scheduler: SchedulerInterface,
+        self,
+        scheduler: SchedulerInterface,
+        credentials: Optional[CredentialsType] = None,
     ):
-        super().__init__(scheduler, url=CRAN_MIRROR, instance="cran")
+        super().__init__(
+            scheduler, url=CRAN_MIRROR, instance="cran", credentials=credentials
+        )
 
     def get_pages(self) -> Iterator[PageType]:
         """

swh/lister/cran/tests/test_lister.py

@@ -89,3 +89,34 @@ def test_cran_lister_cran(datadir, swh_scheduler, mocker):
         }
 
         filtered_origins[0].last_update == parse_packaged_date(package_info)
+
+
+@pytest.mark.parametrize(
+    "credentials, expected_credentials",
+    [
+        (None, []),
+        ({"key": "value"}, []),
+        (
+            {"CRAN": {"cran": [{"username": "user", "password": "pass"}]}},
+            [{"username": "user", "password": "pass"}],
+        ),
+    ],
+)
+def test_lister_cran_instantiation_with_credentials(
+    credentials, expected_credentials, swh_scheduler
+):
+    lister = CRANLister(swh_scheduler, credentials=credentials)
+
+    # Credentials are allowed in constructor
+    assert lister.credentials == expected_credentials
+
+
+def test_lister_cran_from_configfile(swh_scheduler_config, mocker):
+    load_from_envvar = mocker.patch("swh.lister.pattern.load_from_envvar")
+    load_from_envvar.return_value = {
+        "scheduler": {"cls": "local", **swh_scheduler_config},
+        "credentials": {},
+    }
+    lister = CRANLister.from_configfile()
+    assert lister.scheduler is not None
+    assert lister.credentials is not None