ci: release tagging script

tag.ps1

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+# 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

tag.sh

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+#!/usr/bin/env bash
+
+set -e
+
+# Release tagging script for Linux
+
+# Usage:
+#   ./tag.sh <version>
+
+if ! [ -x "$(command -v git)" ]; then
+    echo 'Error: git is not installed.' >&2
+    exit 1
+fi
+if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+    echo 'Error: not in a git repository.' >&2
+    exit 1
+fi
+
+if [ "$#" -eq 0 ]; then
+    echo "Error: no version argument given." >&2
+    exit 1
+fi
+if ! [[ $1 =~ ^[v]?[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+    echo "Error: invalid version argument." >&2
+    exit 1
+fi
+if ! [[ $1 =~ ^[v] ]]; then
+    version="v$1"
+else
+    version="$1"
+fi
+
+tags=($version "app/$version" "core/$version")
+
+for tag in "${tags[@]}"; do
+    echo "Tagging $tag..."
+    git tag "$tag"
+done
+
+echo "Done."