refactor: extract ApplicationVersion version from sentry

config/initializers/application_version.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class ApplicationVersion
+  @@current = nil
+
+  # Detect the current release version, which helps Sentry identifying the current release
+  # or can be used as cache key when for some contents susceptible to change between releases.
+  #
+  # The deploy process can write a "version" file at root
+  # containing a string identifying the release, like the sha256 commit used by its release.
+  # It defaults to a random string if the file is not found (so each restart will behave like a new version)
+  def self.current
+    @@current ||= begin
+      version = Rails.root.join('version')
+      version.readable? ? version.read.strip : SecureRandom.hex
+    end
+    @@current.presence
+  end
+end