Add GitHub action infrastructure.

action.yml

@@ -0,0 +1,28 @@
+name: 'GitHub Action for GraalVM'
+description: 'Set up a specific version of GraalVM Community Edition'
+author: 'GraalVM Developers'
+branding:
+  icon: 'terminal'  
+  color: 'blue'
+inputs:
+  version:
+    required: true
+    description: 'GraalVM version (release, latest, nightly, trunk).'
+  java-version:
+    required: true
+    description: 'Java version (11 or 17, 8 or 16 for older releases).'
+  components:
+    required: false
+    description: 'Comma-separated list of GraalVM components to be installed'
+    default: ''
+  github-token:
+    required: false
+    description: 'Set it to secrets.GITHUB_TOKEN to increase rate limits when accessing the GitHub API'
+    default: ''
+  set-java-home:
+    required: false
+    description: 'Set $JAVA_HOME to the GraalVM installation. Default: true'
+    default: 'true'
+runs:
+  using: 'node12'
+  main: 'dist/index.js'