Add freeze config option for autoupdate command

This commit adds a new 'freeze' option to the CONFIG_SCHEMA, allowing users
to set 'freeze: true' in their pre-commit configuration file.

The intend are two effects, when setting `freeze: True`:
* Enables freeze automatically when running `pre-commit autoupdate` (no
  need then anymore to specify --freeze).
* Enables https://pre-commit.ci/ to freeze hooks as part of update PRs.

pre_commit/clientlib.py

@@ -466,6 +466,7 @@ CONFIG_SCHEMA = cfgv.Map(
     cfgv.Optional('files', check_string_regex, ''),
     cfgv.Optional('exclude', check_string_regex, '^$'),
     cfgv.Optional('fail_fast', cfgv.check_bool, False),
+    cfgv.Optional('freeze', cfgv.check_bool, False),
     cfgv.WarnAdditionalKeys(
         (
             'repos',
@@ -477,6 +478,7 @@ CONFIG_SCHEMA = cfgv.Map(
             'fail_fast',
             'minimum_pre_commit_version',
             'ci',
+            'freeze',
         ),
         warn_unknown_keys_root,
     ),

pre_commit/commands/autoupdate.py

@@ -176,6 +176,8 @@ def autoupdate(
         if repo['repo'] not in {LOCAL, META}
     ]
 
+    freeze = freeze or load_config(config_file)['freeze']
+
     rev_infos: list[RevInfo | None] = [None] * len(config_repos)
     jobs = jobs or xargs.cpu_count()  # 0 => number of cpus
     jobs = min(jobs, len(repos) or len(config_repos))  # max 1-per-thread

tests/commands/autoupdate_test.py

@@ -139,6 +139,17 @@ def test_rev_info_update_does_not_freeze_if_already_sha(out_of_date):
     assert new_info.frozen is None
 
 
+def test_autoupdate_freeze_from_config(tagged, tmpdir):
+    git_commit(cwd=tagged.path)
+    repo = make_config_from_repo(tagged.path, rev=tagged.original_rev)
+    contents = {'repos': [repo], 'freeze': True}
+    cfg = tmpdir.join(C.CONFIG_FILE)
+    write_config(str(tmpdir), contents)
+
+    assert autoupdate(str(cfg), freeze=False, tags_only=True) == 0
+    assert f'rev: {tagged.head_rev}  # frozen: v1.2.3' in cfg.read()
+
+
 def test_autoupdate_up_to_date_repo(up_to_date, tmpdir):
     contents = (
         f'repos:\n'