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

Conflicts:
- `.github/workflows/build-image.yml`:
  Upstream switched to pushing to both DockerHub and GitHub Container
  Repository, while glitch-soc was already pushing to the latter only.
  Updated our configuration to be slightly more consistent with upstream's
  naming and styling, but kept our behavior.
- `Gemfile.lock`:
  Updated dependencies textually too close to glitch-soc only hcaptcha
  dependency.
  Updated dependencies as upstream did.
- `README.md`:
  Upstream updated its README, but we have a completely different one.
  Kept our README, though it probably should be reworked at some point.
- `app/views/auth/sessions/two_factor.html.haml`:
  Minor style fix upstream that's on a line glitch-soc removed because
  of its different theming system.
  Kept our file as is.
- `spec/controllers/health_controller_spec.rb`:
  This file apparently did not exist upstream, upstream created it with
  different contents but it is functionally the same.
  Switched to upstream's version of the file.
- `spec/presenters/instance_presenter_spec.rb`:
  Upstream changed the specs around `GITHUB_REPOSITORY`, while glitch-soc
  had its own code because it's a fork and does not have the same default
  source URL.
  Took upstream's change, but with glitch-soc's repo as the default case.
- `yarn.lock`:
  Upstream dependencies textually too close to a glitch-soc only one.
  Updated dependencies as upstream did.

Gemfile

@@ -4,7 +4,6 @@ source 'https://rubygems.org'
 ruby '>= 2.7.0', '< 3.3.0'
 
 gem 'pkg-config', '~> 1.5'
-gem 'rexml', '~> 3.2'
 
 gem 'puma', '~> 6.1'
 gem 'rails', '~> 6.1.7'
@@ -40,7 +39,7 @@ end
 gem 'net-ldap', '~> 0.17'
 gem 'omniauth-cas', '~> 2.0'
 gem 'omniauth-saml', '~> 1.10'
-gem 'omniauth_openid_connect', '~> 0.6.0'
+gem 'omniauth_openid_connect', '~> 0.6.1'
 gem 'omniauth', '~> 1.9'
 gem 'omniauth-rails_csrf_protection', '~> 0.1'
 
@@ -105,6 +104,7 @@ group :development, :test do
   gem 'fuubar', '~> 2.5'
   gem 'i18n-tasks', '~> 1.0', require: false
   gem 'rspec-rails', '~> 6.0'
+  gem 'rspec_chunked', '~> 0.6'
   gem 'rubocop-performance', require: false
   gem 'rubocop-rails', require: false
   gem 'rubocop-rspec', require: false
@@ -117,6 +117,7 @@ end
 
 group :test do
   gem 'capybara', '~> 3.38'
+  gem 'climate_control'
   gem 'faker', '~> 3.1'
   gem 'json-schema', '~> 3.0'
   gem 'rack-test', '~> 2.0'
@@ -138,6 +139,7 @@ group :development do
   gem 'memory_profiler'
   gem 'brakeman', '~> 5.4', require: false
   gem 'bundler-audit', '~> 0.9', require: false
+  gem 'haml_lint', require: false
 
   gem 'capistrano', '~> 3.17'
   gem 'capistrano-rails', '~> 1.6'