Switch to using chrome for system tests

Firefox in Ubuntu 22.04 is now only available as a snap and the
snap version does not currently include geckodriver so can't be
used with Selenium for testing.

Chrome in headless mode doesn't support using preferences to set
the language so we have to modify the environment instead.

Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update \
       curl \
       default-jre-headless \
       file \
-      firefox-geckodriver \
+      chromium-chromedriver \
       libarchive-dev \
       libffi-dev \
       libgd-dev \

INSTALL.md

@@ -33,7 +33,7 @@ These can be installed on Ubuntu 20.04 or later with:
 sudo apt-get update
 sudo apt-get install ruby2.7 libruby2.7 ruby2.7-dev \
                      libvips-dev libxml2-dev libxslt1-dev nodejs \
-                     apache2 apache2-dev build-essential git-core firefox-geckodriver \
+                     apache2 apache2-dev build-essential git-core chromium-chromedriver \
                      postgresql postgresql-contrib libpq-dev libsasl2-dev \
                      libffi-dev libgd-dev libarchive-dev libbz2-dev yarnpkg
 sudo gem2.7 install bundler

script/vagrant/setup/provision.sh

@@ -18,7 +18,7 @@ apt-get upgrade -y
 # install packages as explained in INSTALL.md
 apt-get install -y ruby2.7 libruby2.7 ruby2.7-dev \
                      libxml2-dev libxslt1-dev nodejs yarnpkg \
-                     apache2 apache2-dev build-essential git-core firefox-geckodriver \
+                     apache2 apache2-dev build-essential git-core chromium-chromedriver \
                      postgresql postgresql-contrib libpq-dev libvips-dev \
                      libsasl2-dev libffi-dev libgd-dev libarchive-dev libbz2-dev
 gem2.7 install rake

test/application_system_test_case.rb

@@ -2,12 +2,12 @@
 
 ENV.delete("http_proxy")
 
+ENV["LANG"] = "en_US.UTF-8"
+
 ActiveSupport.on_load(:action_dispatch_system_test_case) do
   ActionDispatch::SystemTesting::Server.silence_puma = true
 end
 
 class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
-  driven_by :selenium, :using => :headless_firefox do |options|
-    options.add_preference("intl.accept_languages", "en")
-  end
+  driven_by :selenium, :using => :headless_chrome
 end