feat: linux appimage build with docker, egl fallback, and webkitgtk fixes

build-appimage.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+IMAGE_NAME="zeroclock-appimage-builder"
+OUTPUT_DIR="$SCRIPT_DIR/dist-appimage"
+
+echo "Building Docker image (Ubuntu 24.04 / glibc 2.39)..."
+docker build -f Dockerfile.appimage -t "$IMAGE_NAME" "$SCRIPT_DIR"
+
+echo "Extracting AppImage..."
+rm -rf "$OUTPUT_DIR"
+mkdir -p "$OUTPUT_DIR"
+
+CONTAINER_ID=$(docker create "$IMAGE_NAME")
+docker cp "$CONTAINER_ID:/app/src-tauri/target/release/bundle/appimage/." "$OUTPUT_DIR/"
+docker rm "$CONTAINER_ID" > /dev/null
+
+echo ""
+echo "Done! AppImage(s) in: $OUTPUT_DIR/"
+ls -lh "$OUTPUT_DIR/"*.AppImage 2>/dev/null || echo "(no .AppImage files found  - check build output above)"