Remove bundler enforcement on ruby 2.3

The fix for rubygems/rubygems#3570 was released with bundler 2.2.0.rc.1.

.github/workflows/test.yml

@@ -29,7 +29,6 @@ jobs:
         - { os: windows-2019, ruby: debug }
         - { os: windows-2019, ruby: truffleruby }
         - { os: windows-2019, ruby: truffleruby-head }
-        - { os: macos-11.0, ruby: truffleruby }
 
     name: ${{ matrix.os }} ${{ matrix.ruby }}
     runs-on: ${{ matrix.os }}

README.md

@@ -16,7 +16,7 @@ This action currently supports these versions of MRI, JRuby and TruffleRuby:
 | ----------- | -------- |
 | `ruby` | 2.1.9, 2.2, 2.3.0 - 2.3.8, 2.4.0 - 2.4.10, 2.5.0 - 2.5.8, 2.6.0 - 2.6.6, 2.7.2, 3.0.0, head, debug, mingw, mswin |
 | `jruby` | 9.1.17.0, 9.2.9.0 - 9.2.13.0, head |
-| `truffleruby` | 19.3.0 - 20.3.0, head |
+| `truffleruby` | 19.3.0 - 21.0.0, head |
 
 `ruby-debug` is the same as `ruby-head` but with assertions enabled (`-DRUBY_DEBUG=1`).  
 On Windows, `mingw` and `mswin` are `ruby-head` builds using the MSYS2/MinGW and the MSVC toolchains respectively.
@@ -162,13 +162,22 @@ If there is a `Gemfile.lock` (or `$BUNDLE_GEMFILE.lock` or `gems.locked`), `bund
 To use a `Gemfile` which is not at the root or has a different name, set `BUNDLE_GEMFILE` in the `env` at the job level
 as shown in the [example](#matrix-of-gemfiles).
 
-When there is no lockfile, one is generated with `bundle lock`, which is the same as `bundle install` would do first before actually fetching any gem.
-In other words, it works exactly like `bundle install`.
-The hash of the generated lockfile is then used for caching, which is the only correct approach.
+#### bundle config
+
+When using `bundler-cache: true` you might notice there is no good place to run `bundle config ...` commands.
+These can be replaced by `BUNDLE_*` environment variables, which are also faster.
+They should be set the `env` at the job level as shown in the [example](#matrix-of-gemfiles).
+See the [Bundler docs](https://bundler.io/man/bundle-config.1.html) or look at `.bundle/config` locally for the environment variable names,
 
 To perform caching, this action will use `bundle config --local path $PWD/vendor/bundle`.  
 Therefore, the Bundler `path` should not be changed in your workflow for the cache to work (no `bundle config path`).
 
+#### How it Works
+
+When there is no lockfile, one is generated with `bundle lock`, which is the same as `bundle install` would do first before actually fetching any gem.
+In other words, it works exactly like `bundle install`.
+The hash of the generated lockfile is then used for caching, which is the only correct approach.
+
 #### Caching `bundle install` manually
 
 It is also possible to cache gems manually, but this is not recommended because it is verbose and *very difficult* to do correctly.

bundler.js

@@ -72,9 +72,6 @@ export async function installBundler(bundlerVersionInput, lockFile, platform, ru
   if (engine === 'ruby' && rubyVersion.match(/^2\.[012]/)) {
     console.log('Bundler 2 requires Ruby 2.3+, using Bundler 1 on Ruby <= 2.2')
     bundlerVersion = '1'
-  } else if (engine === 'ruby' && rubyVersion.startsWith('2.3')) {
-    console.log('Ruby 2.3 has a bug with Bundler 2 (https://github.com/rubygems/rubygems/issues/3570), using Bundler 1 instead on Ruby 2.3')
-    bundlerVersion = '1'
   } else if (engine === 'jruby' && rubyVersion.startsWith('9.1')) { // JRuby 9.1 targets Ruby 2.3, treat it the same
     console.log('JRuby 9.1 has a bug with Bundler 2 (https://github.com/ruby/setup-ruby/issues/108), using Bundler 1 instead on JRuby 9.1')
     bundlerVersion = '1'

dist/index.js

@@ -44608,9 +44608,6 @@ async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefi
   if (engine === 'ruby' && rubyVersion.match(/^2\.[012]/)) {
     console.log('Bundler 2 requires Ruby 2.3+, using Bundler 1 on Ruby <= 2.2')
     bundlerVersion = '1'
-  } else if (engine === 'ruby' && rubyVersion.startsWith('2.3')) {
-    console.log('Ruby 2.3 has a bug with Bundler 2 (https://github.com/rubygems/rubygems/issues/3570), using Bundler 1 instead on Ruby 2.3')
-    bundlerVersion = '1'
   } else if (engine === 'jruby' && rubyVersion.startsWith('9.1')) { // JRuby 9.1 targets Ruby 2.3, treat it the same
     console.log('JRuby 9.1 has a bug with Bundler 2 (https://github.com/ruby/setup-ruby/issues/108), using Bundler 1 instead on JRuby 9.1')
     bundlerVersion = '1'
@@ -45360,6 +45357,7 @@ function getVersions(platform) {
     "truffleruby": [
       "19.3.0", "19.3.1",
       "20.0.0", "20.1.0", "20.2.0", "20.3.0",
+      "21.0.0",
       "head"
     ]
   }
@@ -52088,7 +52086,7 @@ async function setupRuby(options = {}) {
   const [engine, parsedVersion] = parseRubyEngineAndVersion(inputs['ruby-version'])
 
   let installer
-  if (platform.startsWith('windows-') && engine === 'ruby') {
+  if (platform.startsWith('windows-') && engine !== 'jruby') {
     installer = __webpack_require__(216)
   } else {
     installer = __webpack_require__(974)

index.js

@@ -38,7 +38,7 @@ export async function setupRuby(options = {}) {
   const [engine, parsedVersion] = parseRubyEngineAndVersion(inputs['ruby-version'])
 
   let installer
-  if (platform.startsWith('windows-') && engine === 'ruby') {
+  if (platform.startsWith('windows-') && engine !== 'jruby') {
     installer = require('./windows')
   } else {
     installer = require('./ruby-builder')

ruby-builder-versions.js

@@ -19,6 +19,7 @@ export function getVersions(platform) {
     "truffleruby": [
       "19.3.0", "19.3.1",
       "20.0.0", "20.1.0", "20.2.0", "20.3.0",
+      "21.0.0",
       "head"
     ]
   }