fix(server): don't log invalid token in release builds

[tessus]

Description

The server logs a sent token, if the token is not valid:

e.g.: rpaste -a invalid_token -V

[2023-08-13T19:24:30Z WARN  rustypaste::auth] authorization failure for a.b.c.d (header: invalid_token)

This change prints the token only in debug mode. In release mode the log entry will look like this:

[2023-08-13T19:24:30Z WARN  rustypaste::auth] authorization failure for a.b.c.d

Motivation and Context

fixes #111

Let's say you use rpaste with the token in the config file (or curl with the auth_token as env var or in a file), but use different rustypaste servers. If you forget only once to add the -a flag (or add the header to curl), a production token for another instance will be logged.

How Has This Been Tested?

• cargo test
• fixtures
• manual testing

Changelog Entry

### Fixed

- Don't log invalid token in release builds

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (77f0e42) 69.47% compared to head (8d6618e) 69.47%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #112   +/-   ##
=======================================
  Coverage   69.47%   69.47%           
=======================================
  Files          11       11           
  Lines         557      557           
=======================================
  Hits          387      387           
  Misses        170      170           

Flag	Coverage Δ
unit-tests	69.47% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/auth.rs	90.90% <ø> (ø)

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[orhun]

Neat 💯