allow regex in output glob case insensitive .tif

preprocessor/preprocessor/steps/output.py

 import os
 from os.path import join, basename
-from glob import glob
 from uuid import uuid4
+from fnmatch import translate
+import re
 
 from ..util import replace_ext, gdal
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 def output_step(source_dir: os.PathLike, target_dir: os.PathLike, options: dict=None):
@@ -15,8 +19,9 @@ def output_step(source_dir: os.PathLike, target_dir: os.PathLike, options: dict=
         raise ValueError('Unsupported driver %s' % frmt)
     extension = driver.GetMetadata().get('DMD_EXTENSIONS', 'tif').split(' ')[0]
     # warp each individual file
+    match = re.compile(translate('*.tif'), re.IGNORECASE).match
     warped_files = []
-    for filename in glob(join(source_dir, '*.tif')):
+    for filename in [join(source_dir, fnm) for fnm in os.listdir(source_dir) if match(fnm)]:
         target_filename = join(target_dir, replace_ext(basename(filename), extension))
         gdal.Warp(target_filename, filename, options=gdal.WarpOptions(
             **options