refactor: Redo as 'composite' Action

action.ps1

@@ -1,20 +1,19 @@
 #!/usr/bin/env pwsh
 
-$ErrorActionPreference = 'Stop'
-
-Import-Module $PSScriptRoot/lib/GitHubActionsCore
-
-# read inputs, set output
-$stagingPath = Get-ActionInput staging-path -Required
-$null = New-Item $stagingPath -ItemType Directory -ErrorAction:Ignore
-Set-ActionOutput staging-path $stagingPath
+[CmdletBinding()]
+param (
+    [Parameter(Mandatory)]
+    [string] $StagingPath
+)
 
 # check if there are any cat/gst files to process, otherwise short-circuit out
 if ((Get-ChildItem -Recurse -Include *.cat, *.gst -File).Length -eq 0) {
     Write-Host "No datafiles to process." -ForegroundColor Green
     exit 0
 }
 
+$null = New-Item $stagingPath -ItemType Directory -ErrorAction:Ignore
+
 function PrintAndInvoke{
     param($command)
     Write-Host $command -ForegroundColor Cyan
@@ -33,6 +32,6 @@ if ($null -eq (Get-Command $wham -ErrorAction SilentlyContinue)) {
 # TODO sometime in future "wham build/ci"
 
 # Publish snapshot to staging path
-PrintAndInvoke "$wham publish -f snapshot -o ""$stagingPath"" --verbosity detailed"
+PrintAndInvoke "$wham publish -f snapshot -o ""$StagingPath"" --verbosity detailed"
 
 Write-Host "Done" -ForegroundColor Green

action.yml

@@ -16,9 +16,15 @@ inputs:
 outputs:
   staging-path:
     description: Path where generated assets were saved.
+    value: ${{ inputs.staging-path }}
 runs:
-  using: node12
-  main: dist/index.js
+  using: composite
+  steps:
+    - run: ${{ github.action_path }}/action.ps1 -StagingPath $env:STAGING_PATH
+      shell: pwsh
+      id: script
+      env:
+        STAGING_PATH: ${{ inputs.staging-path }}
 branding:
   icon: book-open
   color: blue