Merge pull request #14 from rubygems/add-old-ruby-warning

Add warnings for unmaintained Ruby versions

.github/workflows/ci.yml

@@ -12,15 +12,15 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu, macos, windows ]
-        ruby: [ 2.2, 2.7, head ]
+        ruby: [ 2.7, 3.0, 3.1, 3.2, head ]
         include:
           - { os: windows , ruby: mingw }
         exclude:
           - { os: windows , ruby: head }
 
     steps:
       - name: repo checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: load ruby
         uses: ruby/setup-ruby@v1

check.rb

@@ -1,6 +1,13 @@
 #!/usr/bin/env ruby
 # Encoding: utf-8
 
+if RUBY_VERSION < "2.7"
+  warn "!!! WARNING !!!",
+        "Ruby #{RUBY_VERSION} has reached end-of-life, and is unsupported.",
+        "This script may not work.",
+        ""
+end
+
 if ARGV.include?("-h") || ARGV.include?("--help")
   puts "USAGE: check.rb [HOSTNAME] [TLS_VERSION] [VERIFY]"
   puts "  default: check.rb rubygems.org auto VERIFY_PEER"