Add PDF generation for QR codes

Gemfile.lock

@@ -128,6 +128,15 @@ GEM
       railties (>= 6.1.0)
     faker (3.5.2)
       i18n (>= 1.8.11, < 2)
+    ferrum (0.17.1)
+      addressable (~> 2.5)
+      base64 (~> 0.2)
+      concurrent-ruby (~> 1.1)
+      webrick (~> 1.7)
+      websocket-driver (~> 0.7)
+    ferrum_pdf (3.0.1)
+      actionpack (>= 6.0.0)
+      ferrum (~> 0.15)
     friendly_id (5.5.1)
       activerecord (>= 4.0.0)
     fugit (1.12.1)
@@ -420,6 +429,7 @@ GEM
       activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
+    webrick (1.9.1)
     websocket (1.2.11)
     websocket-driver (0.8.0)
       base64
@@ -452,6 +462,7 @@ DEPENDENCIES
   debug
   factory_bot_rails
   faker
+  ferrum_pdf (~> 3.0)
   friendly_id (~> 5.5.0)
   importmap-rails
   jbuilder