Revert "Remove Site CI check"

[bitwiseman]

This reverts commit e317813.

Fixes #1229

Description

Before submitting a PR:

We love getting PRs, but we hate asking people for the same basic changes every time.

• Push your changes to a branch other than main. Create your PR from that branch.
• Add JavaDocs and other comments
• Write tests that run and pass in CI. See CONTRIBUTING.md for details on how to capture snapshot data.
• Run mvn -D enable-ci clean install site locally. If this command doesn't succeed, your change will not pass CI.

When creating a PR:

• Fill in the "Description" above.
• Enable "Allow edits from maintainers".

[codecov]

Codecov Report

Merging #1268 (4c60ee5) into main (cbd89d7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1268   +/-   ##
=========================================
  Coverage     77.50%   77.50%           
  Complexity     1905     1905           
=========================================
  Files           189      189           
  Lines          6000     6000           
  Branches        328      328           
=========================================
  Hits           4650     4650           
  Misses         1150     1150           
  Partials        200      200           

Impacted Files	Coverage Δ
src/main/java/org/kohsuke/github/GHRepository.java	68.42% <ø> (ø)

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