diff --git a/.github/workflows/release-zip.yml b/.github/workflows/release-zip.yml
new file mode 100644
index 0000000..d672b33
--- /dev/null
+++ b/.github/workflows/release-zip.yml
@@ -0,0 +1,34 @@
+name: Release zip
+
+# Attaches the install zip (the main script plus Modules\, nothing else) to a
+# release when it is published. Re-run by hand for an existing tag if needed.
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: Existing release tag to build the zip for (e.g. v1.1)
+        required: true
+
+permissions:
+  contents: write
+
+jobs:
+  zip:
+    name: Build and attach install zip
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.release.tag_name || inputs.tag }}
+
+      - name: Build and upload
+        env:
+          GH_TOKEN: ${{ github.token }}
+          TAG: ${{ github.event.release.tag_name || inputs.tag }}
+        run: |
+          zip="Manga-Conversion-Script-${TAG}.zip"
+          git archive --format=zip --prefix="Manga Conversion Script/" -o "$zip" HEAD "Conversion Script Main.ps1" Modules
+          unzip -l "$zip"
+          gh release upload "$TAG" "$zip" --clobber
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..eb0f620
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,42 @@
+name: Tests
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  harnesses:
+    name: Harnesses
+    runs-on: windows-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+
+      # Windows PowerShell 5.1 (shell: powershell), the version the script targets.
+      # The harnesses build their own stand-in cjxl/magick, so no real tools are needed.
+      - name: Run every harness
+        shell: powershell
+        run: |
+          $failed = @()
+          foreach ($harness in Get-ChildItem -Path .\_Harness -Filter *.Harness.ps1 | Sort-Object Name) {
+              Write-Host ("::group::" + $harness.BaseName)
+              & powershell.exe -NoProfile -ExecutionPolicy Bypass -File $harness.FullName
+              $code = $LASTEXITCODE
+              Write-Host "::endgroup::"
+              if ($code -eq 0) {
+                  Write-Host ("PASS  " + $harness.BaseName)
+              } else {
+                  Write-Host ("::error title=" + $harness.BaseName + "::exited with code " + $code)
+                  $failed += $harness.BaseName
+              }
+          }
+          if ($failed.Count -gt 0) {
+              Write-Host ("Failed: " + ($failed -join ", "))
+              exit 1
+          }
+          Write-Host "All harnesses passed."
diff --git a/_Harness/FileDeletion.Harness.ps1 b/_Harness/FileDeletion.Harness.ps1
index 33ccd37..8e38c34 100644
--- a/_Harness/FileDeletion.Harness.ps1
+++ b/_Harness/FileDeletion.Harness.ps1
@@ -154,8 +154,15 @@ Write-Host "=== Scenario G: Move-ToRecycleBin target actually lands in the Recyc
 $uniqueNameG = "filedeletion-harness-" + [guid]::NewGuid().ToString("N") + ".txt"
 $fileG = New-ScratchFile -Name $uniqueNameG
 $null = Move-ToRecycleBin -ItemPath $fileG
-$foundInBinG = Test-ItemInRecycleBin -FileName $uniqueNameG
-Test-Assert $foundInBinG "Move-ToRecycleBin's target is found in the real Windows Recycle Bin (genuinely recoverable, not just deleted)"
+if ($env:GITHUB_ACTIONS -eq 'true') {
+    # GitHub's Windows runners run as a service with no interactive shell, so
+    # the Recycle Bin can't be browsed there. Check only that the file left.
+    Test-Assert (-not (Test-Path -LiteralPath $fileG)) "Move-ToRecycleBin's target is gone from its original location"
+    Write-Host "  [SKIP] Recycle Bin lookup - not available on GitHub Actions runners" -ForegroundColor Yellow
+} else {
+    $foundInBinG = Test-ItemInRecycleBin -FileName $uniqueNameG
+    Test-Assert $foundInBinG "Move-ToRecycleBin's target is found in the real Windows Recycle Bin (genuinely recoverable, not just deleted)"
+}
 Write-Host ""
 
 # ==============================================================================