Support both Rails 7.1 and 7.2 in the example app

Using the multiple Gemfile approach spelled out in bootboot's README:
https://github.com/Shopify/bootboot/blob/2ee386b19ca76d40cd31bcb534d9ed24637872e8/README.md

example/Gemfile

@@ -1,11 +1,4 @@
 source "https://rubygems.org"
 
 gem "rails"
-gem "sqlite3"
-gem "puma"
-gem "webpacker"
-gem "bootsnap", require: false
-
-group :development, :test do
-  gem "cypress-rails", path: ".."
-end
+eval_gemfile "Gemfile.common"

example/Gemfile.common

@@ -0,0 +1,10 @@
+source "https://rubygems.org"
+
+gem "sqlite3"
+gem "puma"
+gem "webpacker"
+gem "bootsnap", require: false
+
+group :development, :test do
+  gem "cypress-rails", path: ".."
+end

example/Gemfile.lock

@@ -8,100 +8,96 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (7.1.3)
-      actionpack (= 7.1.3)
-      activesupport (= 7.1.3)
+    actioncable (7.2.1)
+      actionpack (= 7.2.1)
+      activesupport (= 7.2.1)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
       zeitwerk (~> 2.6)
-    actionmailbox (7.1.3)
-      actionpack (= 7.1.3)
-      activejob (= 7.1.3)
-      activerecord (= 7.1.3)
-      activestorage (= 7.1.3)
-      activesupport (= 7.1.3)
-      mail (>= 2.7.1)
-      net-imap
-      net-pop
-      net-smtp
-    actionmailer (7.1.3)
-      actionpack (= 7.1.3)
-      actionview (= 7.1.3)
-      activejob (= 7.1.3)
-      activesupport (= 7.1.3)
-      mail (~> 2.5, >= 2.5.4)
-      net-imap
-      net-pop
-      net-smtp
+    actionmailbox (7.2.1)
+      actionpack (= 7.2.1)
+      activejob (= 7.2.1)
+      activerecord (= 7.2.1)
+      activestorage (= 7.2.1)
+      activesupport (= 7.2.1)
+      mail (>= 2.8.0)
+    actionmailer (7.2.1)
+      actionpack (= 7.2.1)
+      actionview (= 7.2.1)
+      activejob (= 7.2.1)
+      activesupport (= 7.2.1)
+      mail (>= 2.8.0)
       rails-dom-testing (~> 2.2)
-    actionpack (7.1.3)
-      actionview (= 7.1.3)
-      activesupport (= 7.1.3)
+    actionpack (7.2.1)
+      actionview (= 7.2.1)
+      activesupport (= 7.2.1)
       nokogiri (>= 1.8.5)
       racc
-      rack (>= 2.2.4)
+      rack (>= 2.2.4, < 3.2)
       rack-session (>= 1.0.1)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    actiontext (7.1.3)
-      actionpack (= 7.1.3)
-      activerecord (= 7.1.3)
-      activestorage (= 7.1.3)
-      activesupport (= 7.1.3)
+      useragent (~> 0.16)
+    actiontext (7.2.1)
+      actionpack (= 7.2.1)
+      activerecord (= 7.2.1)
+      activestorage (= 7.2.1)
+      activesupport (= 7.2.1)
       globalid (>= 0.6.0)
       nokogiri (>= 1.8.5)
-    actionview (7.1.3)
-      activesupport (= 7.1.3)
+    actionview (7.2.1)
+      activesupport (= 7.2.1)
       builder (~> 3.1)
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    activejob (7.1.3)
-      activesupport (= 7.1.3)
+    activejob (7.2.1)
+      activesupport (= 7.2.1)
       globalid (>= 0.3.6)
-    activemodel (7.1.3)
-      activesupport (= 7.1.3)
-    activerecord (7.1.3)
-      activemodel (= 7.1.3)
-      activesupport (= 7.1.3)
+    activemodel (7.2.1)
+      activesupport (= 7.2.1)
+    activerecord (7.2.1)
+      activemodel (= 7.2.1)
+      activesupport (= 7.2.1)
       timeout (>= 0.4.0)
-    activestorage (7.1.3)
-      actionpack (= 7.1.3)
-      activejob (= 7.1.3)
-      activerecord (= 7.1.3)
-      activesupport (= 7.1.3)
+    activestorage (7.2.1)
+      actionpack (= 7.2.1)
+      activejob (= 7.2.1)
+      activerecord (= 7.2.1)
+      activesupport (= 7.2.1)
       marcel (~> 1.0)
-    activesupport (7.1.3)
+    activesupport (7.2.1)
       base64
       bigdecimal
-      concurrent-ruby (~> 1.0, >= 1.0.2)
+      concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
       minitest (>= 5.1)
-      mutex_m
-      tzinfo (~> 2.0)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
     base64 (0.2.0)
-    bigdecimal (3.1.6)
+    bigdecimal (3.1.8)
     bootsnap (1.18.3)
       msgpack (~> 1.2)
-    builder (3.2.4)
-    concurrent-ruby (1.2.3)
+    builder (3.3.0)
+    concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     crass (1.0.6)
     date (3.3.4)
-    drb (2.2.0)
-      ruby2_keywords
-    erubi (1.12.0)
+    drb (2.2.1)
+    erubi (1.13.0)
     globalid (1.2.1)
       activesupport (>= 6.1)
-    i18n (1.14.1)
+    i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     io-console (0.7.2)
-    irb (1.11.2)
-      rdoc
+    irb (1.14.0)
+      rdoc (>= 4.0.0)
       reline (>= 0.4.2)
+    logger (1.6.1)
     loofah (2.22.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -110,30 +106,29 @@ GEM
       net-imap
       net-pop
       net-smtp
-    marcel (1.0.2)
+    marcel (1.0.4)
     mini_mime (1.1.5)
-    mini_portile2 (2.8.5)
-    minitest (5.22.2)
+    mini_portile2 (2.8.7)
+    minitest (5.25.1)
     msgpack (1.7.2)
-    mutex_m (0.2.0)
-    net-imap (0.4.10)
+    net-imap (0.4.16)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
     net-protocol (0.2.2)
       timeout
-    net-smtp (0.4.0.1)
+    net-smtp (0.5.0)
       net-protocol
-    nio4r (2.7.0)
-    nokogiri (1.16.2)
+    nio4r (2.7.3)
+    nokogiri (1.16.7)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     psych (5.1.2)
       stringio
     puma (6.4.2)
       nio4r (~> 2.0)
-    racc (1.7.3)
+    racc (1.8.1)
     rack (3.1.7)
     rack-proxy (0.7.7)
       rack
@@ -144,49 +139,50 @@ GEM
     rackup (2.1.0)
       rack (>= 3)
       webrick (~> 1.8)
-    rails (7.1.3)
-      actioncable (= 7.1.3)
-      actionmailbox (= 7.1.3)
-      actionmailer (= 7.1.3)
-      actionpack (= 7.1.3)
-      actiontext (= 7.1.3)
-      actionview (= 7.1.3)
-      activejob (= 7.1.3)
-      activemodel (= 7.1.3)
-      activerecord (= 7.1.3)
-      activestorage (= 7.1.3)
-      activesupport (= 7.1.3)
+    rails (7.2.1)
+      actioncable (= 7.2.1)
+      actionmailbox (= 7.2.1)
+      actionmailer (= 7.2.1)
+      actionpack (= 7.2.1)
+      actiontext (= 7.2.1)
+      actionview (= 7.2.1)
+      activejob (= 7.2.1)
+      activemodel (= 7.2.1)
+      activerecord (= 7.2.1)
+      activestorage (= 7.2.1)
+      activesupport (= 7.2.1)
       bundler (>= 1.15.0)
-      railties (= 7.1.3)
+      railties (= 7.2.1)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.6.0)
       loofah (~> 2.21)
       nokogiri (~> 1.14)
-    railties (7.1.3)
-      actionpack (= 7.1.3)
-      activesupport (= 7.1.3)
-      irb
+    railties (7.2.1)
+      actionpack (= 7.2.1)
+      activesupport (= 7.2.1)
+      irb (~> 1.13)
       rackup (>= 1.0.0)
       rake (>= 12.2)
       thor (~> 1.0, >= 1.2.2)
       zeitwerk (~> 2.6)
-    rake (13.1.0)
-    rdoc (6.6.2)
+    rake (13.2.1)
+    rdoc (6.7.0)
       psych (>= 4.0.0)
-    reline (0.4.2)
+    reline (0.5.10)
       io-console (~> 0.5)
-    ruby2_keywords (0.0.5)
+    securerandom (0.3.1)
     semantic_range (3.0.0)
     sqlite3 (1.7.2)
       mini_portile2 (~> 2.8.0)
-    stringio (3.1.0)
-    thor (1.3.0)
+    stringio (3.1.1)
+    thor (1.3.2)
     timeout (0.4.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    useragent (0.16.10)
     webpacker (5.4.4)
       activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
@@ -196,7 +192,7 @@ GEM
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    zeitwerk (2.6.13)
+    zeitwerk (2.6.18)
 
 PLATFORMS
   ruby

example/Gemfile.rails71

@@ -0,0 +1,4 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 7.1", "< 7.2"
+eval_gemfile "Gemfile.common"