Switch to composite action

action.yml

@@ -11,6 +11,14 @@ inputs:
     required: false
     default: 'true'
 
+# Note:
+# - inputs.* should be manually mapped to INPUT_* due to https://github.com/actions/runner/issues/665
+# - Use GITHUB_*/RUNNER_* instead of github.*/runner.* due to https://github.com/actions/runner/issues/2185
 runs:
-  using: node16
-  main: main.js
+  using: composite
+  steps:
+    - run: bash --noprofile --norc "${GITHUB_ACTION_PATH:?}/main.sh"
+      shell: bash
+      env:
+        INPUT_TOOL: ${{ inputs.tool }}
+        INPUT_CHECKSUM: ${{ inputs.checksum }}