aur: split into tutabridge-git and tutabridge-bin packages

Add a prebuilt tutabridge-bin package (downloads the published x86_64 CLI
binary, no Rust build) alongside the build-from-source tutabridge-git, each
in its own directory with a PKGBUILD and .SRCINFO. Update the maintainer
address and the packaging README for the two-package layout.

packaging/aur/tutabridge-bin/PKGBUILD

@@ -0,0 +1,31 @@
+# Maintainer: spartanz51 <a.m@tuta.com>
+#
+# Prebuilt headless TutaBridge CLI/daemon: downloads the published x86_64
+# binary from the GitHub release, no Rust build. The GUI is not packaged here.
+# For a build-from-source VCS package, see tutabridge-git.
+
+pkgname=tutabridge-bin
+pkgver=0.1.0rc1
+pkgrel=1
+pkgdesc="Local IMAP/SMTP bridge for Tuta encrypted email (prebuilt headless CLI/daemon)"
+arch=('x86_64')
+url="https://github.com/spartanz51/tutabridge"
+license=('GPL-3.0-or-later')
+depends=('gcc-libs' 'dbus')
+optdepends=('gnome-keyring: persist the Tuta session across reboots (Secret Service)'
+            'kwallet: alternative Secret Service provider')
+provides=('tutabridge')
+conflicts=('tutabridge')
+_tag=v0.1.0-rc.1
+source=("tutabridge-$pkgver::$url/releases/download/$_tag/tutabridge-linux-x86_64"
+        "tutabridge.service::https://raw.githubusercontent.com/spartanz51/tutabridge/$_tag/packaging/systemd/tutabridge.service"
+        "LICENSE::https://raw.githubusercontent.com/spartanz51/tutabridge/$_tag/LICENSE")
+sha256sums=('e4589807752da816ef3b84cf1d13e9793eca3621d0da9805ca96d3c3151d52cd'
+            '9c398acf860036a8912a3f0686cfd6dc55cb714fc3ddbff68c21755777cd439f'
+            '947215ddc328843b76022d5b77e1ca3b1152301778d33e24491e5064e92fc6cf')
+
+package() {
+	install -Dm755 "tutabridge-$pkgver" "$pkgdir/usr/bin/tutabridge"
+	install -Dm644 "tutabridge.service" "$pkgdir/usr/lib/systemd/user/tutabridge.service"
+	install -Dm644 "LICENSE" "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}