fix(ci): add container-suffix to audit and test jobs

The ci-audit and ci-test reusable workflows default container-suffix to base, which produces prod-base:<version> — an image that does not exist. Set container-suffix: ruby so these jobs use prod-ruby:<version>.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: wphillipmoore

.github/workflows/ci.yml

@@ -31,6 +31,7 @@ jobs:
     with:
       language: ruby
       versions: ${{ inputs.ruby-versions || '["3.2", "3.3", "3.4"]' }}
+      container-suffix: ruby
 
   integration-tests:
     name: "test / integration / ${{ matrix.ruby-version }}"
@@ -88,6 +89,7 @@ jobs:
     with:
       language: ruby
       versions: ${{ inputs.ruby-versions || '["3.2", "3.3", "3.4"]' }}
+      container-suffix: ruby
 
   version:
     uses: vergil-project/vergil-actions/.github/workflows/ci-version-bump.yml@v2.0