fix: convert CRLF to LF before creating target object

This is because file hashes get calculated differently on Windows vs
Linux if line endings are first saved as LF then get converted to CRLF
on Windows. To resolve, normalize all line endings to LF.

taf/tuf/repository.py

@@ -30,7 +30,12 @@
     yk = YubikeyMissingLibrary()  # type: ignore
 
 from taf.constants import DEFAULT_RSA_SIGNATURE_SCHEME
-from taf.utils import default_backend, get_file_details, on_rm_error
+from taf.utils import (
+    default_backend,
+    get_file_details,
+    on_rm_error,
+    normalize_file_line_endings,
+)
 from tuf.api.metadata import (
     Metadata,
     MetaFile,
@@ -711,8 +716,12 @@ def _create_target_object(
         self, filesystem_path: str, target_path: str, custom: Optional[Dict]
     ) -> TargetFile:
         """
-        Creates a TUF target object, later used to update targets metadata
+        Creates a TUF target object, later used to update targets metadata.
+        It's first necessary to normalize file line endings (convert all line endings to unix style endings)
+        before adding a target objects due to hashes getting calculated differently when using CRLF vs LF line endings.
+        So we instead convert all to unix style endings.
         """
+        normalize_file_line_endings(filesystem_path)
         data = Path(filesystem_path).read_text().encode()
         target_file = TargetFile.from_data(
             target_file_path=target_path,