RCBC-546: Add GHA job checking example syntax

.github/workflows/examples.yml

@@ -0,0 +1,25 @@
+name: Examples
+
+on:
+  push:
+    branches:
+      - release/3.*
+      - temp/3.*
+
+  pull_request:
+    branches:
+      - release/3.*
+      - temp/3.*
+
+jobs:
+  check-syntax:
+    name: Check Syntax
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '4.0'
+
+      - run: rake check_syntax

Rakefile

@@ -0,0 +1,20 @@
+desc "Check syntax of all Ruby example files (equivalent to running `ruby -c` on each file)"
+task :check_syntax do
+  pass = 0
+  fail_count = 0
+  errors = []
+
+  Dir.glob("modules/**/*.rb").sort.each do |file|
+    source = File.read(file)
+    RubyVM::InstructionSequence.compile(source, file)
+    pass += 1
+  rescue SyntaxError => e
+    fail_count += 1
+    errors << file
+    puts "FAIL: #{e.message}"
+  end
+
+  puts "\nResults: #{pass} files passed, #{fail_count} failed"
+
+  abort "Files with errors:\n#{errors.map { |f| "  #{f}" }.join("\n")}" if errors.any?
+end