Use shared gravatar config for all Rails gitlab.yml.erb configmaps

What does this MR do?

Adds a shared gitlab.appConfig.gravatar helper template to ensure global.appConfig.gravatar settings are consistently applied to all Rails pods' gitlab.yml.erb configmaps.

Changes:

• Creates templates/_gitlab_appConfig_gravatar.tpl helper that renders gravatar.plain_url and gravatar.ssl_url from global.appConfig.gravatar
• Replaces inline gravatar configuration in webservice, sidekiq, and geo-logcursor with the shared helper
• Adds gravatar configuration to toolbox and migrations (previously missing)

This ensures parity across all Rails components (webservice, sidekiq, geo-logcursor, toolbox, migrations) as requested in the issue.

Related issues

Closes #6067

Author checklist

For general guidance, please follow our Contributing guide.

Required

For anything in this list which will not be completed, please provide a reason in the MR discussion.

• Merge Request Title and Description are up to date, accurate, and descriptive.

• MR targeting the appropriate branch.

• MR has a green pipeline.

  • Will be verified after push and pipeline runs

• Documentation created/updated.

  • No documentation changes required. This MR ensures existing gravatar configuration (documented at https://docs.gitlab.com/charts/charts/globals#gravatarlibravatar-settings) is applied uniformly to all Rails pods without changing documented behavior.

• Tests added/updated, and test plan for scenarios not covered by automated tests.

  • Manual testing performed: helm dependency build . helm template test .
    -f values.yaml
    --set certmanager-issuer.email=test@example.com
    --set global.appConfig.gravatar.plainUrl=http://example.com
    --set global.appConfig.gravatar.sslUrl=https://example.com \

    rendered.yaml - Verified gravatar.plain_url and gravatar.ssl_url are present in gitlab.yml.erb for:

    • ConfigMap/test-webservice
    • ConfigMap/test-sidekiq
    • ConfigMap/test-geo-logcursor
    • ConfigMap/test-toolbox
    • ConfigMap/test-migrations
  • Test plan: Automated tests should verify that all Rails configmaps include gravatar configuration when global.appConfig.gravatar is set.

• Equivalent MR/issue for omnibus-gitlab opened.

  • Not applicable. This MR only affects Helm charts' gitlab.yml.erb template generation, not omnibus-gitlab templates.

Reviewers checklist

• MR has a green pipeline on https://gitlab.com/gitlab-org/charts/gitlab.

• Consider downstream impact to the Operator, as per evaluating impact from changes to GitLab chart.

  • No breaking changes. This MR only adds missing gravatar configuration to toolbox and migrations, and consolidates existing configuration into a shared helper. All Rails pods now receive the same gravatar settings from global.appConfig.gravatar.