Parse hostname from /proc/sys/kernel/hostname

[CinisSec]

Adds the /proc/sys/kernel/hostname path to the paths mentioned in issue 606

[Miauwkeru]

Could you change the title of the PR and your commit message according to our commit style guidelines?

https://docs.dissect.tools/en/latest/contributing/style-guide.html#commit-message-style-and-formatting

[Paradoxis]

Do we always want to add the file, or only when a user doesn't specify their own paths? If we always want to include the file you're better off cloning the paths, and merging these four hostname paths together:

If the list order doesn't matter you can combine the two and cast it to a set to make the values unique:

paths = set(paths + ["/etc/hostname", "/etc/HOSTNAME", "/proc/sys/kernel/hostname", redhat_legacy_path])

If the list order does matter, just create a copy and add each unique item to it:

paths = paths.copy()  # ensures that we don't modify the existing list in-place
for path in ["/etc/hostname", "/etc/HOSTNAME", "/proc/sys/kernel/hostname", redhat_legacy_path]:
    if path not in paths:
        paths.append(path)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.70%. Comparing base (79aa5dd) to head (6e5428a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #704   +/-   ##
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  Coverage   77.70%   77.70%           
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  Files         326      326           
  Lines       28481    28481           
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  Hits        22131    22131           
  Misses       6350     6350           

Flag	Coverage Δ
unittests	77.70% <100.00%> (ø)

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