Add `state_machines` gem

Gemfile

@@ -77,6 +77,8 @@ gem "public_uid"
 gem "kaminari"
 gem "nokogiri", ">= 1.12.0"
 gem "nokogiri-styles"
+gem "state_machines", github: "state-machines/state_machines"
+gem "state_machines-activerecord"
 
 # Security
 gem "cancancan", "~> 1.17.0"

Gemfile.lock

@@ -1,3 +1,9 @@
+GIT
+  remote: https://github.com/state-machines/state_machines.git
+  revision: 6a9bb977e0b599eef49fc1fea31b12af113905da
+  specs:
+    state_machines (0.5.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -274,6 +280,12 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
+    state_machines-activemodel (0.8.0)
+      activemodel (>= 5.1)
+      state_machines (>= 0.5.0)
+    state_machines-activerecord (0.8.0)
+      activerecord (>= 5.1)
+      state_machines-activemodel (>= 0.8.0)
     stimulus_reflex (3.4.1)
       cable_ready (>= 4.5)
       nokogiri
@@ -369,6 +381,8 @@ DEPENDENCIES
   selenium-webdriver
   sentry-ruby (~> 4.8)
   spring
+  state_machines!
+  state_machines-activerecord
   stimulus_reflex
   strong_migrations
   sunspot (~> 2.5.0)