ci: add Windows launcher and PowerShell checks

.github/workflows/checks.yml

@@ -0,0 +1,28 @@
+name: Source checks
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  checks:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: cmd/launcher/go.mod
+          cache: false
+      - name: Test launcher
+        working-directory: cmd/launcher
+        run: go test ./...
+      - name: Vet launcher
+        working-directory: cmd/launcher
+        run: go vet ./...
+      - name: Check PowerShell syntax
+        shell: pwsh
+        run: ./scripts/check-powershell-syntax.ps1

README.md

@@ -32,6 +32,17 @@ cd cmd/launcher
 go test ./...
 ```
 
+GitHub Actions runs launcher tests, `go vet`, and PowerShell syntax checks on
+Windows for pushes and pull requests. These checks use source files only; they
+do not download or package Firefox or uBlock Origin. Run the same syntax check
+locally from the repository root:
+
+```powershell
+pwsh -File scripts/check-powershell-syntax.ps1
+```
+
+The syntax check parses scripts without executing their packaging operations.
+
 ## Licensing
 
 The Nano Origin-original files in this repository are MIT licensed; see [LICENSE](LICENSE).

scripts/check-powershell-syntax.ps1

@@ -0,0 +1,28 @@
+[CmdletBinding()]
+param(
+  [string]$ScriptsPath = $PSScriptRoot
+)
+
+$ErrorActionPreference = 'Stop'
+Set-StrictMode -Version Latest
+
+$scripts = @(Get-ChildItem -LiteralPath $ScriptsPath -Filter '*.ps1' -File -Recurse)
+if ($scripts.Count -eq 0) { throw "No PowerShell scripts found in: $ScriptsPath" }
+
+$invalid = 0
+foreach ($script in $scripts) {
+  $tokens = $null
+  $parseErrors = $null
+  $null = [System.Management.Automation.Language.Parser]::ParseFile(
+    $script.FullName, [ref]$tokens, [ref]$parseErrors
+  )
+  foreach ($parseError in $parseErrors) {
+    $invalid++
+    Write-Host ('{0}:{1}:{2}: {3}' -f $script.FullName,
+      $parseError.Extent.StartLineNumber, $parseError.Extent.StartColumnNumber,
+      $parseError.Message)
+  }
+}
+
+if ($invalid -gt 0) { throw "Found $invalid PowerShell parse error(s)." }
+Write-Host "PowerShell syntax passed for $($scripts.Count) scripts."