When deciding whether to ignore a path, Git normally checks gitignore
patterns from multiple sources, with the following order of precedence,
from highest to lowest [...]:

(1) [...]
(2) Patterns read from a .gitignore file in the same directory as the path,
    or in any parent directory (up to the top-level of the working tree),
    with patterns in the higher level files being overridden by those in
    lower level files down to the directory containing the file.

    These patterns match relative to the location of the .gitignore file.
    A project normally includes such .gitignore files in its repository,
    containing patterns for files generated as part of the project build.
(3) ...
(4) ...