You can use the top-level ignore: key to tell Codecov to ignore certain paths.

Add a list of paths (folders or file names) to your codecov.yml file under the ignore key to exclude files from being collected by Codecov. Ignored files will be skipped during processing.

ignore:
  - "path/to/folder"  # ignore folders and all its contents
  - "test_*.rb"       # wildcards accepted
  - "**/*.py"         # glob accepted

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Glob Recursive Behavior

The pattern folder/* will not match recursively in the folder.
Please use this folder/**/*.