build: adapt Arch Linux packaging

packaging/arch/.SRCINFO

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+pkgbase = qemby
+	pkgdesc = Desktop client for Emby and Jellyfin media servers
+	pkgver = 0.0.5
+	pkgrel = 1
+	url = https://github.com/AlanHJ/qEmby
+	arch = x86_64
+	license = MIT
+	makedepends = cmake
+	makedepends = ninja
+	makedepends = pkgconf
+	makedepends = qt6-tools
+	depends = gcc-libs
+	depends = glibc
+	depends = mpv
+	depends = qcoro
+	depends = qt6-base
+	depends = qt6-svg
+	depends = qt6-websockets
+	depends = spdlog
+	source = qemby-0.0.5.tar.gz::https://github.com/AlanHJ/qEmby/archive/refs/tags/v0.0.5.tar.gz
+	sha256sums = SKIP
+
+pkgname = qemby

packaging/arch/PKGBUILD

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+# Maintainer: local
+
+pkgname=qemby
+pkgver=0.0.5
+pkgrel=1
+pkgdesc="Desktop client for Emby and Jellyfin media servers"
+arch=('x86_64')
+url="https://github.com/AlanHJ/qEmby"
+license=('MIT')
+depends=(
+  'gcc-libs'
+  'glibc'
+  'mpv'
+  'qcoro'
+  'qt6-base'
+  'qt6-svg'
+  'qt6-websockets'
+  'spdlog'
+)
+makedepends=(
+  'cmake'
+  'ninja'
+  'pkgconf'
+  'qt6-tools'
+)
+source=("${pkgname}-${pkgver}.tar.gz::${url}/archive/refs/tags/v${pkgver}.tar.gz")
+sha256sums=('SKIP')
+
+build() {
+  cmake -S "${srcdir}/qEmby-${pkgver}" -B "${srcdir}/build" -G Ninja \
+    -DCMAKE_BUILD_TYPE=None \
+    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DCMAKE_INSTALL_LIBDIR=lib \
+    -DQEMBY_USE_SYSTEM_DEPS=ON \
+    -DQEMBY_FETCHCONTENT_FALLBACK=OFF \
+    -DFETCHCONTENT_FULLY_DISCONNECTED=ON \
+    -DQEMBY_NATIVE_OPTIMIZE=OFF \
+    -DQEMBY_ENABLE_IPO=OFF
+  cmake --build "${srcdir}/build"
+}
+
+package() {
+  DESTDIR="${pkgdir}" cmake --install "${srcdir}/build" --prefix /usr
+  install -Dm644 "${srcdir}/qEmby-${pkgver}/LICENSE" \
+    "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
+}

packaging/arch/README.md

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+# Arch package
+
+This PKGBUILD is intended for Arch Linux and AUR-style release packaging. It
+builds from the project release tag, uses Arch system libraries, and disables
+FetchContent so package builds do not download dependencies during CMake
+configure.
+
+Before publishing a release package, replace the temporary `SKIP` checksum in
+`PKGBUILD` with a real checksum, for example by running `updpkgsums` after the
+tag archive is available.
+
+## Build
+
+```fish
+cd packaging/arch
+makepkg -f
+```
+
+## Install
+
+```fish
+cd packaging/arch
+sudo pacman -U qemby-*.pkg.tar.zst
+```
+
+## Run
+
+```fish
+qemby
+```
+
+## Uninstall
+
+```fish
+sudo pacman -R qemby
+```