ci: add coverage and ruff (#1383)

* add coverage calculation and push

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* new codecov version and usage of token

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* enable ruff formatter instead of black and isort

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* apply ruff lint fixes

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* apply ruff unsafe fixes

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* add removed imports

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* runs 1 on linter issues

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* finalize linter fixes

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* Update pyproject.toml

Co-authored-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>
Signed-off-by: Michele Dolfi <97102151+dolfim-ibm@users.noreply.github.com>

---------

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
Signed-off-by: Michele Dolfi <97102151+dolfim-ibm@users.noreply.github.com>
Co-authored-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>

docling/backend/pypdfium2_backend.py

@@ -1,8 +1,9 @@
 import logging
 import random
+from collections.abc import Iterable
 from io import BytesIO
 from pathlib import Path
-from typing import TYPE_CHECKING, Iterable, List, Optional, Union
+from typing import TYPE_CHECKING, List, Optional, Union
 
 import pypdfium2 as pdfium
 import pypdfium2.raw as pdfium_c
@@ -29,7 +30,7 @@ class PyPdfiumPageBackend(PdfPageBackend):
         self.valid = True  # No better way to tell from pypdfium.
         try:
             self._ppage: pdfium.PdfPage = pdfium_doc[page_no]
-        except PdfiumError as e:
+        except PdfiumError:
             _log.info(
                 f"An exception occurred when loading page {page_no} of document {document_hash}.",
                 exc_info=True,
@@ -225,7 +226,6 @@ class PyPdfiumPageBackend(PdfPageBackend):
     def get_page_image(
         self, scale: float = 1, cropbox: Optional[BoundingBox] = None
     ) -> Image.Image:
-
         page_size = self.get_size()
 
         if not cropbox: