Add support for Rubinius

* Only works on ubuntu-latest.

.github/workflows/test.yml

@@ -14,10 +14,16 @@ jobs:
       matrix:
         os: [ ubuntu-16.04, ubuntu-18.04, macos-latest, windows-latest ]
         # Use various version syntaxes here for testing
-        ruby: [ .ruby-version, 2.3, ruby-2.4, 2.5, ruby-2.6.5, 2.7.0, jruby, truffleruby ]
+        ruby: [ .ruby-version, 2.3, ruby-2.4, 2.5, ruby-2.6.5, 2.7.0, jruby, truffleruby, rubinius ]
         exclude:
         - os: windows-latest
           ruby: truffleruby
+        - os: ubuntu-16.04
+          ruby: rubinius
+        - os: macos-latest
+          ruby: rubinius
+        - os: windows-latest
+          ruby: rubinius
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2

dist/index.js

@@ -4867,7 +4867,12 @@ async function getAvailableVersions(engine) {
 
 async function install(platform, ruby) {
   const rubyPrefix = await downloadAndExtract(platform, ruby)
+
   core.addPath(path.join(rubyPrefix, 'bin'))
+  if (ruby.startsWith('rubinius')) {
+    core.addPath(path.join(rubyPrefix, 'gems', 'bin'))
+  }
+
   return rubyPrefix
 }
 

ruby-install-builder.js

@@ -17,7 +17,12 @@ export async function getAvailableVersions(engine) {
 
 export async function install(platform, ruby) {
   const rubyPrefix = await downloadAndExtract(platform, ruby)
+
   core.addPath(path.join(rubyPrefix, 'bin'))
+  if (ruby.startsWith('rubinius')) {
+    core.addPath(path.join(rubyPrefix, 'gems', 'bin'))
+  }
+
   return rubyPrefix
 }