ci: release tagging script

tag.ps1

@@ -0,0 +1,35 @@
+# Release tagging script for Windows (PowerShell)
+
+# Usage:
+#   ./tag.ps1 <version>
+
+if (!(Get-Command git -ErrorAction SilentlyContinue)) {
+    Write-Host "Error: git is not installed." -ForegroundColor Red
+    exit 1
+}
+if (!(git rev-parse --is-inside-work-tree 2>$null)) {
+    Write-Host "Error: not in a git repository." -ForegroundColor Red
+    exit 1
+}
+
+if ($args.Length -eq 0) {
+    Write-Host "Error: no version argument given." -ForegroundColor Red
+    exit 1
+}
+if ($args[0] -notmatch "^[v]?[0-9]+\.[0-9]+\.[0-9]+$") {
+    Write-Host "Error: invalid version argument." -ForegroundColor Red
+    exit 1
+}
+if ($args[0] -notmatch "^[v]") {
+    $args[0] = "v" + $args[0]
+}
+
+$version = $args[0]
+$tags = @($version, "app/$version", "core/$version")
+
+foreach ($tag in $tags) {
+    Write-Host "Tagging $tag..."
+    git tag $tag
+}
+
+Write-Host "Done." -ForegroundColor Green