Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `.github/workflows/build-image.yml`:
  Upstream entirely refactored this, while we changed the docker repository
  to upload to and disabled the “latest” tag.
  Applied the repository change to `.github/workflows/build-*.yml`, as well
  as disabling native ARMv64 builds.
- `README.md`:
  We have a completely different README.
  Kept ours.
- `app/views/admin/settings/shared/_links.html.haml`:
  Upstream refactored, we had an extra item.
  Refactored as upstream did.
- `spec/controllers/api/v1/timelines/public_controller_spec.rb`:
  Upstream deleted this file, to be replaced by a request spec at
  `spec/requests/api/v1/timelines/public_spec.rb`.
  We had an extra bit about enabling the public timelines because we have
  different defaults than upstream.
  Moved that bit to `spec/requests/api/v1/timelines/public_spec.rb`

app/views/admin/reports/actions/preview.html.haml

@@ -32,7 +32,7 @@
       .fields-group
         = text_area_tag :text, nil, placeholder: t('admin.reports.summary.warning_placeholder')
 
-      - if !@report.other?
+      - unless @report.other?
         %p
           %strong= t('user_mailer.warning.reason')
           = t("user_mailer.warning.categories.#{@report.category}")

app/views/admin/reports/show.html.haml

@@ -88,7 +88,7 @@
             = t('simple_form.yes')
           - else
             = t('simple_form.no')
-    - if !@report.action_taken_by_account.nil?
+    - if @report.action_taken_by_account.present?
       .report-header__details__item
         .report-header__details__item__header
           %strong= t('admin.reports.action_taken_by')