Workaround https://github.com/oracle/truffleruby/issues/2780

bundler.js

@@ -117,7 +117,8 @@ export async function installBundler(bundlerVersionInput, rubygemsInputSet, lock
 
   const gem = path.join(rubyPrefix, 'bin', 'gem')
   // Workaround for https://github.com/rubygems/rubygems/issues/5245
-  const force = (platform.startsWith('windows-') && engine === 'ruby' && floatVersion >= 3.1) ? ['--force'] : []
+  // and for https://github.com/oracle/truffleruby/issues/2780
+  const force = ((platform.startsWith('windows-') && engine === 'ruby' && floatVersion >= 3.1) || (engine === 'truffleruby')) ? ['--force'] : []
 
   const versionParts = [...bundlerVersion.matchAll(/\d+/g)].length
   const bundlerVersionConstraint = versionParts === 3 ? bundlerVersion : `~> ${bundlerVersion}.0`

dist/index.js

@@ -131,7 +131,8 @@ async function installBundler(bundlerVersionInput, rubygemsInputSet, lockFile, p
 
   const gem = path.join(rubyPrefix, 'bin', 'gem')
   // Workaround for https://github.com/rubygems/rubygems/issues/5245
-  const force = (platform.startsWith('windows-') && engine === 'ruby' && floatVersion >= 3.1) ? ['--force'] : []
+  // and for https://github.com/oracle/truffleruby/issues/2780
+  const force = ((platform.startsWith('windows-') && engine === 'ruby' && floatVersion >= 3.1) || (engine === 'truffleruby')) ? ['--force'] : []
 
   const versionParts = [...bundlerVersion.matchAll(/\d+/g)].length
   const bundlerVersionConstraint = versionParts === 3 ? bundlerVersion : `~> ${bundlerVersion}.0`