Add support for Ubuntu 20.04

README.md

@@ -16,7 +16,7 @@ This action currently supports these versions of MRI, JRuby and TruffleRuby:
 | ----------- | -------- |
 | Ruby | 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, 2.7.1, head, debug, mingw, mswin |
 | JRuby | 9.1.17.0, 9.2.9.0 - 9.2.11.1, head |
-| TruffleRuby | 19.3.0 - 20.0.0, head |
+| TruffleRuby | 19.3.0 - 20.1.0, head |
 | Rubinius | 4.14 |
 
 `ruby-debug` is the same as `ruby-head` but with assertions enabled (`-DRUBY_DEBUG=1`).  
@@ -35,7 +35,7 @@ The action works for all [GitHub-hosted runners](https://help.github.com/en/acti
 
 | Operating System | Versions |
 | ----------- | -------- |
-| Ubuntu  | `ubuntu-latest` (= `ubuntu-18.04`), `ubuntu-16.04` |
+| Ubuntu  | `ubuntu-20.04`, `ubuntu-latest` (= `ubuntu-18.04`), `ubuntu-16.04` |
 | macOS   | `macos-latest` |
 | Windows | `windows-latest` |
 

dist/index.js

@@ -1489,7 +1489,7 @@ function getVersions(platform) {
     ],
     "truffleruby": [
       "19.3.0", "19.3.1",
-      "20.0.0",
+      "20.0.0", "20.1.0",
       "head"
     ]
   }

ruby-builder-versions.js

@@ -16,7 +16,7 @@ export function getVersions(platform) {
     ],
     "truffleruby": [
       "19.3.0", "19.3.1",
-      "20.0.0",
+      "20.0.0", "20.1.0",
       "head"
     ]
   }

versions-strings-for-builder.rb

@@ -0,0 +1,15 @@
+hash = File.read('ruby-builder-versions.js')[/\bversions = {[^}]+}/]
+versions = eval hash
+
+by_minor = versions[:ruby].group_by { |v| v[/^\d\.\d/] }
+
+p by_minor['2.2']
+p by_minor['2.3']
+
+(4..7).each do |minor|
+  p by_minor["2.#{minor}"].map { |v| "ruby-#{v}" }
+end
+
+p (versions[:jruby] - %w[head]).map { |v| "jruby-#{v}" }
+
+p (versions[:truffleruby] - %w[head]).map { |v| "truffleruby-#{v}" }