Trim the value in case it contains newlines - #2480

Changes

Hello friends, I'm trying to self-host plausible on my server and have observed that if I add a file named (for example) secrets/LISTEN_IP to configure the bind IP I'll get the following error:

Compiling 1 file (.ex)
** (RuntimeError) Invalid LISTEN_IP '172.19.130.83
' error: :einval
    /home/serafeim/plausible/config/runtime.exs:20: (file)

(notice that I get the same error when configuring the DATABASE_URL or whatever comes first)

It seems that for whatever reason the File.read! will insert a newline at the end of the file. Notice that I have double checked the file with vim and it does not contain a newline at the end or at least I don't know how to make the file not have a newline at the end.

Thus I'm adding a String.trim() there to fix that thing; even if I am doing something wrong and my files do contain a newline at the end, adding a String.trim() there definite won't hurt :)

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Tests

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