Accept Dockerfile filename and pin CI to Python 3.11

- parser: accept extension-less files whose name is in ACCEPTED_FILENAMES
  (Dockerfile), alongside the existing .lock support, so container/build
  tooling PRs are not rejected as invalid. Adds tests.
- ci: fixit 0.1.4 imports the stdlib distutils removed in Python 3.12;
  pin setup-python to 3.11 so the test job can collect and run again.

Author: priya-sundaram-dev

.github/workflows/main.yml

@@ -12,7 +12,9 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.x"
+          # fixit 0.1.4 imports the stdlib ``distutils`` module, which was removed
+          # in Python 3.12. Pin to 3.11 until the fixit pin is upgraded.
+          python-version: "3.11"
       - uses: actions/cache@v3
         with:
           path: |

algorithms_keeper/parser/files_parser.py

@@ -23,6 +23,9 @@ class BaseFilesParser:
     DOCS_EXTENSIONS: Collection[str] = ()
     ACCEPTED_EXTENSIONS: Collection[str] = ()
 
+    # Extension-less filenames that are nonetheless valid (e.g. ``Dockerfile``).
+    ACCEPTED_FILENAMES: Collection[str] = ()
+
     def __init__(
         self,
         pr_files: Iterable[File],
@@ -46,12 +49,15 @@ def validate_extension(self) -> str:
           `ACCEPTED_EXTENSIONS` constant.
 
         NOTE: Extensionless files will be considered valid only if it is present in
-        the ".github" directory. Eg: ".github/CODEOWNERS"
+        the ".github" directory (eg: ".github/CODEOWNERS") or if its name is listed in
+        ``ACCEPTED_FILENAMES`` (eg: "Dockerfile").
         """
         invalid_filepath = []
         for file in self.pr_files:
             filepath = file.path
             if not filepath.suffix:
+                if filepath.name in self.ACCEPTED_FILENAMES:
+                    continue
                 if ".github" not in filepath.parts:
                     if filepath.parent.name:  # noqa: SIM114
                         invalid_filepath.append(file.name)

algorithms_keeper/parser/python_parser.py

@@ -80,6 +80,9 @@ class PythonParser(BaseFilesParser):
         *DOCS_EXTENSIONS,
     )
 
+    # Extension-less files whose exact name is accepted (container/build tooling).
+    ACCEPTED_FILENAMES: tuple[str, ...] = ("Dockerfile",)
+
     def __init__(
         self,
         pr_files: Iterable[File],

tests/test_parser.py

@@ -58,6 +58,9 @@ def test_contains_testfile(parser: PythonParser, expected: int) -> None:
         ),
         # Lock files are committed for reproducible CI, so they are valid.
         (get_parser("uv.lock, sol1.py"), ""),
+        # ``Dockerfile`` is an accepted extension-less filename.
+        (get_parser("Dockerfile, sol1.py"), ""),
+        (get_parser(".devcontainer/Dockerfile"), ""),
     ),
 )
 def test_validate_extension(parser: PythonParser, expected: str) -> None: