Use @InputFile on RepositoryConfig#getCustomKeyFile

[jcgay]

Gradle displays this message (without failing) with version 7.6:

> Task :currentVersion
Execution optimizations have been disabled for task ':currentVersion' to ensure correctness due to the following reasons:
  - In plugin 'pl.allegro.tech.build.axion.release.ReleasePlugin$Inject' type 'pl.allegro.tech.build.axion.release.OutputCurrentVersionTask' property 'versionConfig.repository.customKeyFile' has @Input annotation used on property of type 'RegularFileProperty'. Reason: A property of type 'RegularFileProperty' annotated with @Input cannot determine how to interpret the file. Please refer to https://docs.gradle.org/7.6/userguide/validation_problems.html#incorrect_use_of_input_annotation for more details about this problem.

Fixes #559

[jcgay]

I have not added any test. I could test the output for the offending message but does it makes sense ? 😇
Or let me know if you have some in the integration test suite that should be updated :)

[codecov-commenter]

Codecov Report

Merging #560 (0320388) into main (c73b032) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #560   +/-   ##
=========================================
  Coverage     61.03%   61.03%           
  Complexity      384      384           
=========================================
  Files            81       81           
  Lines          1504     1504           
  Branches        141      141           
=========================================
  Hits            918      918           
  Misses          521      521           
  Partials         65       65           

Impacted Files	Coverage Δ
...build/axion/release/domain/RepositoryConfig.groovy	93.33% <ø> (ø)

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[bgalek]

@jcgay LGTM! Thx!