Group A: source upstream binaries instead of self-built artifacts

The AUR does not allow packages to ship a binary tarball built by the
maintainer - a -bin package must repackage a deliverable published by
upstream. These six packages now do that:

  snapx-bin            upstream's self-contained Linux tar.zst
  zapzap-bin           upstream's pure-Python wheel
  faugus-launcher-bin  upstream's arch-independent .deb
  wiiudownloader-bin   upstream's AppImage
  waydroid-helper-bin  upstream's AppImage
  chiaki-ng-bin        upstream's AppImage

All six drop build_artifact() and switch to refresh_checksums(), so CI no
longer builds or hosts anything - it only tracks upstream's assets.

Where the asset name carries build metadata that does not follow from
pkgver (snapx, faugus-launcher), refresh_checksums() resolves it via the
GitHub API and syncs an _asset variable in the PKGBUILD.

Dependency lists are re-derived from what the bundles actually resolve
outside themselves; the AppImage payloads land in /opt with wrappers in
/usr/bin, because their entry points resolve paths relative to argv[0].

chiaki-ng-bin/pkg.sh

@@ -1,60 +1,26 @@
-# chiaki-ng-bin - prebuilt package of https://github.com/streetpea/chiaki-ng
-# (free PlayStation Remote Play client, C/C++ + Qt6).
+# chiaki-ng-bin - chiaki-ng (https://github.com/streetpea/chiaki-ng), a free
+# PlayStation Remote Play client (C/C++ + Qt6).
 #
-# Upstream ships no plain Linux binaries (only AppImage/flatpak), so
-# build_artifact() builds from a git checkout of the release tag (the source
-# tarballs lack the required submodules). Mirrors the AUR source package:
-# system curl instead of the vendored submodule, plus the Qt6GuiPrivate
-# CMake fix carried in this directory.
+# Upstream publishes an AppImage per release, which the PKGBUILD unpacks and
+# installs into /opt - so there is no build step here, only pkgver and the
+# checksums are refreshed on a new version. The license texts are not part of
+# the AppImage and come from the matching source tag.
 
 UPSTREAM_REPO="streetpea/chiaki-ng"
 
-# Installed in CI (pacman) before build_artifact runs.
-BUILD_DEPS=(cmake git python-protobuf python-setuptools protobuf
-            vulkan-headers qt6-base qt6-declarative qt6-svg qt6-webengine
-            sdl2 ffmpeg fftw hidapi json-c libplacebo miniupnpc opus speexdsp
-            openssl curl libssh2)
-
 latest_version() {
   gh api "repos/$UPSTREAM_REPO/releases/latest" --jq '.tag_name' | sed 's/^v//'
 }
 
-# build_artifact <version> <output-file>
-build_artifact() {
-  local ver="$1" outfile="$2"
-  local pkgdir workdir destdir srctree
-  pkgdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-  workdir="$(mktemp -d)"
-  destdir="$(mktemp -d)"
-  srctree="$workdir/src"
+# refresh_checksums <version> <pkgbuild-path>
+refresh_checksums() {
+  local ver="$1" pkgbuild="$2"
+  local sha_img sha_lic
 
-  git clone --branch "v$ver" --depth 1 "https://github.com/$UPSTREAM_REPO.git" "$srctree"
+  sha_img="$(curl -sfL "https://github.com/$UPSTREAM_REPO/releases/download/v$ver/chiaki-ng.AppImage_x86_64" \
+    | sha256sum | cut -d' ' -f1)"
+  sha_lic="$(curl -sfL "https://raw.githubusercontent.com/$UPSTREAM_REPO/v$ver/COPYING" \
+    | sha256sum | cut -d' ' -f1)"
 
-  # use the system curl instead of the vendored submodule
-  git -C "$srctree" rm -q third-party/curl
-  sed -i 's:libcurl_shared:libcurl:' "$srctree/lib/CMakeLists.txt"
-  # newer tags (>= 1.10.0) carry the GuiPrivate fix themselves
-  if ! grep -q 'GuiPrivate' "$srctree/gui/CMakeLists.txt"; then
-    patch -d "$srctree" -p1 < "$pkgdir/Qt6GuiPrivate-fix.patch"
-  fi
-  git -C "$srctree" submodule update --init
-
-  CFLAGS="${CFLAGS:-} -std=gnu17" cmake -B "$workdir/build" -S "$srctree" -Wno-dev \
-    -DCMAKE_BUILD_TYPE=Release \
-    -DCMAKE_INSTALL_PREFIX=/usr \
-    -DCHIAKI_USE_SYSTEM_CURL=ON
-  cmake --build "$workdir/build" -j"$(nproc)"
-  DESTDIR="$destdir" cmake --install "$workdir/build"
-
-  # AGPL-3.0-only-OpenSSL: not a common license, ship the texts
-  mkdir -p "$destdir/usr/share/licenses/chiaki-ng-bin"
-  install -m644 "$srctree/LICENSES/"* "$destdir/usr/share/licenses/chiaki-ng-bin/"
-
-  rm -f "$destdir/usr/share/applications/mimeinfo.cache" \
-        "$destdir/usr/share/icons/hicolor/icon-theme.cache"
-
-  tar --zstd --sort=name --owner=0 --group=0 --numeric-owner --mtime='@0' \
-      -cf "$outfile" -C "$destdir" usr
-
-  rm -rf "$workdir" "$destdir"
+  sed -i "s|^sha256sums=.*|sha256sums=('$sha_img' '$sha_lic')|" "$pkgbuild"
 }