[rubygems/rubygems] Add a CI test for basic rubygems functionality without openssl

The whole test suite actually passes on my system, but it has weird
errors in CI. Since I don't want to spend time on it, instead of running
the whole test suite, I'm just adding a bare test to check that `gem
list` works.

a40d9a394a

util/remove_openssl.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require "rbconfig"
+require "fileutils"
+
+archdir = RbConfig::CONFIG["archdir"]
+rubylibdir = RbConfig::CONFIG["rubylibdir"]
+default_specifications_dir = Gem.default_specifications_dir
+
+openssl_rb = File.join(rubylibdir, "openssl.rb")
+openssl_gemspec = Dir.glob("#{default_specifications_dir}/openssl-*.gemspec").first
+
+openssl_ext = if RUBY_PLATFORM == "java"
+                File.join(rubylibdir, "jopenssl.jar")
+              else
+                File.join(archdir, "openssl.so")
+              end
+
+FileUtils.mv openssl_rb, openssl_rb + "_"
+FileUtils.mv openssl_ext, openssl_ext + "_"
+FileUtils.mv openssl_gemspec, openssl_gemspec + "_" if openssl_gemspec