Resolve "Include asset_sync gem"

Gemfile

@@ -411,3 +411,6 @@ gem 'flipper-active_record', '~> 0.10.2'
 # Structured logging
 gem 'lograge', '~> 0.5'
 gem 'grape_logging', '~> 1.7'
+
+# Asset synchronization
+gem 'asset_sync', '~> 2.2.0'

Gemfile.lock

@@ -58,6 +58,11 @@ GEM
     asciidoctor (1.5.3)
     asciidoctor-plantuml (0.0.7)
       asciidoctor (~> 1.5)
+    asset_sync (2.2.0)
+      activemodel (>= 4.1.0)
+      fog-core
+      mime-types (>= 2.99)
+      unf
     ast (2.3.0)
     atomic (1.1.99)
     attr_encrypted (3.0.3)
@@ -975,6 +980,7 @@ DEPENDENCIES
   asana (~> 0.6.0)
   asciidoctor (~> 1.5.2)
   asciidoctor-plantuml (= 0.0.7)
+  asset_sync (~> 2.2.0)
   attr_encrypted (~> 3.0.0)
   awesome_print (~> 1.2.0)
   babosa (~> 1.0.2)

changelogs/unreleased/40031-include-assset_sync-gem.yml

+---
+title: Add assets_sync gem to Gemfile
+merge_request: 15734
+author:
+type: added

config/initializers/asset_sync.rb

+AssetSync.configure do |config|
+  # Disable the asset_sync gem by default. If it is enabled, but not configured,
+  # asset_sync will cause the build to fail.
+  config.enabled =  if ENV.has_key?('ASSET_SYNC_ENABLED')
+                      ENV['ASSET_SYNC_ENABLED'] == 'true'
+                    else
+                      false
+                    end
+
+  # Pulled from https://github.com/AssetSync/asset_sync/blob/v2.2.0/lib/asset_sync/engine.rb#L15-L40
+  # This allows us to disable asset_sync by default and configure through environment variables
+  # Updates to asset_sync gem should be checked
+  config.fog_provider = ENV['FOG_PROVIDER'] if ENV.has_key?('FOG_PROVIDER')
+  config.fog_directory = ENV['FOG_DIRECTORY'] if ENV.has_key?('FOG_DIRECTORY')
+  config.fog_region = ENV['FOG_REGION'] if ENV.has_key?('FOG_REGION')
+
+  config.aws_access_key_id = ENV['AWS_ACCESS_KEY_ID'] if ENV.has_key?('AWS_ACCESS_KEY_ID')
+  config.aws_secret_access_key = ENV['AWS_SECRET_ACCESS_KEY'] if ENV.has_key?('AWS_SECRET_ACCESS_KEY')
+  config.aws_reduced_redundancy = ENV['AWS_REDUCED_REDUNDANCY'] == true  if ENV.has_key?('AWS_REDUCED_REDUNDANCY')
+
+  config.rackspace_username = ENV['RACKSPACE_USERNAME'] if ENV.has_key?('RACKSPACE_USERNAME')
+  config.rackspace_api_key = ENV['RACKSPACE_API_KEY'] if ENV.has_key?('RACKSPACE_API_KEY')
+
+  config.google_storage_access_key_id = ENV['GOOGLE_STORAGE_ACCESS_KEY_ID'] if ENV.has_key?('GOOGLE_STORAGE_ACCESS_KEY_ID')
+  config.google_storage_secret_access_key = ENV['GOOGLE_STORAGE_SECRET_ACCESS_KEY'] if ENV.has_key?('GOOGLE_STORAGE_SECRET_ACCESS_KEY')
+
+  config.existing_remote_files = ENV['ASSET_SYNC_EXISTING_REMOTE_FILES'] || "keep"
+
+  config.gzip_compression = (ENV['ASSET_SYNC_GZIP_COMPRESSION'] == 'true') if ENV.has_key?('ASSET_SYNC_GZIP_COMPRESSION')
+  config.manifest = (ENV['ASSET_SYNC_MANIFEST'] == 'true') if ENV.has_key?('ASSET_SYNC_MANIFEST')
+end