rewrite: rewrote as github actions runnable

scripts/build-package.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Setups Arch building environment, clones webkit2gtk from the AUR and builds it
+# Outputs the path and filename of the built .pkg.tar.zst to GITHUB_OUTPUT
+
+BUILD_DIR="/build/webkit2gtk"
+
+echo "Initializing pacman keyring..."
+pacman-key --init
+pacman-key --populate archlinux
+
+echo "Updating system..."
+pacman -Syu --noconfirm
+
+echo "Installing build dependencies..."
+pacman -S --noconfirm base-devel git curl jq github-cli
+
+echo "Creating builduser..."
+if ! id builder &>/dev/null; then
+    useradd -m builder
+fi
+echo "builder ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+
+echo "Cloning webkit2gtk AUR repo..."
+git clone https://aur.archlinux.org/webkit2gtk.git "$BUILD_DIR"
+chown -R builder:builder "$BUILD_DIR"
+
+echo "Building package..."
+su builder -c "cd $BUILD_DIR && makepkg -s --noconfirm"
+
+echo "Locating build package..."
+PKG_PATH=$(find "$BUILD_DIR" -maxdepth 1 -name "*.pkg.tar.zst" | head -n 1)
+
+if [ -z "$PKG_PATH" ]; then
+    echo "ERROR: No .pkg.tar.zst found after build" >&2
+    exit 1
+fi
+
+echo "Build package: $PKG_PATH"
+echo "pkg_path=$PKG_PATH" >> "$GITHUB_OUTPUT"
+echo "pkg_name=$(basename "$PKG_PATH")" >> "$GITHUB_OUTPUT"