Skip the gems in the :assets group in CI

.github/workflows/ci.yml

@@ -28,6 +28,7 @@ jobs:
     env:
       RAILS_ENV: test
       DATABASE_URL: "postgresql://postgres:postgres@localhost:5432"
+      BUNDLE_WITHOUT: assets
 
     steps:
       - uses: actions/checkout@v3

Gemfile

@@ -89,19 +89,19 @@ group :development, :test do
 end
 
 
-# Gems used only for assets and not required  
-# in production environments by default.  
-#group :assets do  
-gem 'sass'
-gem 'sass-rails'
-gem 'coffee-rails'
-gem 'uglifier', '>=1.0.3'
-# Provide a JS runtime to execjs without needing to
-# have node, bun, or similar installed on the relevant
-# server. We should write this out asap, along with the
-# rest of the gems in this assets category, as bundling
-# a version of libv8 into a rubygem is just security-vuln
-# city, but hey, what can you do.
-gem 'mini_racer', '~> 0.4.0'
-gem 'yui-compressor'
-#end
+# Gems used only for precompiling assets. They may be skipped using
+# `export BUNDLE_WITHOUT=assets` or `bundle config --local without assets`.
+group :assets do
+  gem 'sass'
+  gem 'sass-rails'
+  gem 'coffee-rails'
+  gem 'uglifier', '>=1.0.3'
+  # Provide a JS runtime to execjs without needing to
+  # have node, bun, or similar installed on the relevant
+  # server. We should write this out asap, along with the
+  # rest of the gems in this assets category, as bundling
+  # a version of libv8 into a rubygem is just security-vuln
+  # city, but hey, what can you do.
+  gem 'mini_racer', '~> 0.4.0'
+  gem 'yui-compressor'
+end

script/install.bash

@@ -42,7 +42,7 @@ bash script/install/bundler.bash || exit 1
 
 bash script/install/nokogiri.bash || exit 1 # nokogiri dependencies
 
-bash script/install/jdk.bash || exit 1 # required by yui-compressor
+[ -n "$CI" ] || bash script/install/jre.bash || exit 1 # required by yui-compressor; skip in CI
 
 sudo bash script/install/isolate.bash || exit 1 # install isolate
 sudo bash script/install/cgroup.bash || exit 1 # install cgroups

script/install/jre.bash

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+cmd="sudo apt-get install default-jre-headless" # java required by yui-compressor gem
+echo "$ $cmd"
+$cmd
+[[ $? -le 1 ]] || exit 1 # apt-get exit 0 = success, 1 = decline, otherwise unknown error
+