build: sematkan info zsync ke AppImage (appimageupdatetool langsung bisa dipakai)

docs: catat bahwa rilis pasca-v1.2.3 membawa update information

.github/workflows/release.yml

@@ -29,6 +29,7 @@ jobs:
       - name: Build AppImage
         env:
           APPIMAGE_EXTRACT_AND_RUN: "1"
+          UPDATE_INFO_URL: https://github.com/${{ github.repository }}/releases/download/${{ github.ref_name }}/GAMEMAX-LCD-x86_64.AppImage.zsync
         run: bash packaging/build_appimage.sh
 
       - name: Smoke test the bundle (no display)

README.md

@@ -225,7 +225,9 @@ The app keeps itself current from GitHub Releases:
 
 Each release publishes three assets: the AppImage, its `.sha256`, and a `.zsync` file for
 `appimageupdatetool` / AppImageUpdate (delta updates). The zsync file is optional — the
-built-in updater does not need it.
+built-in updater does not need it — but the AppImage also carries the zsync URL as embedded
+update information (releases built after v1.2.3), so `appimageupdatetool ./GAMEMAX-LCD.AppImage`
+works directly.
 
 If the check fails (offline, proxy), the message appears in the app log. `GAMEMAX_DEBUG=1`
 also mirrors the log to stdout for headless runs.

packaging/build_appimage.sh

@@ -51,13 +51,19 @@ Terminal=false
 Categories=System;Utility;
 EOF
 
-# 4. package
+# 4. package (UPDATE_INFO_URL menyematkan info zsync agar appimageupdatetool bisa jalan)
+UPDATE_INFO_ARG=""
+if [ -n "${UPDATE_INFO_URL:-}" ]; then
+  UPDATE_INFO_ARG="-u zsync|${UPDATE_INFO_URL}"
+  echo "embedding update information: ${UPDATE_INFO_URL}"
+fi
 if [ ! -x "$BUILD_DIR/appimagetool" ]; then
   curl -fsSL "$APPIMAGETOOL_URL" -o "$BUILD_DIR/appimagetool"
   chmod +x "$BUILD_DIR/appimagetool"
 fi
 OUT="$OUT_DIR/GAMEMAX-LCD-x86_64.AppImage"
-ARCH=x86_64 "$BUILD_DIR/appimagetool" "$APPDIR" "$OUT"
+# shellcheck disable=SC2086
+ARCH=x86_64 "$BUILD_DIR/appimagetool" $UPDATE_INFO_ARG "$APPDIR" "$OUT"
 chmod +x "$OUT"
 echo "built: $OUT"
 echo "verify: $OUT --selftest   (or APPIMAGE_EXTRACT_AND_RUN=1 $OUT --selftest)"