Add Arch Linux package (PKGBUILD) and MIT license

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sovanesyan

LICENSE

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+MIT License
+
+Copyright (c) 2025 Sergey Ovanesyan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

pkg/arch/PKGBUILD

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+# Maintainer: Sergey Ovanesyan <sergey@ovanesyan.com>
+pkgname=calendarchy
+pkgver=0.1.0
+pkgrel=1
+pkgdesc='Terminal calendar app for Google Calendar and iCloud'
+arch=('x86_64')
+url='https://github.com/sovanesyan/calendarchy'
+license=('MIT')
+makedepends=('cargo')
+options=(!lto)
+source=("$pkgname-$pkgver.tar.gz::$url/archive/v$pkgver.tar.gz")
+sha256sums=('SKIP')
+
+prepare() {
+  cd "$pkgname-$pkgver"
+  export RUSTUP_TOOLCHAIN=stable
+  cargo fetch --locked --target "$(rustc -vV | sed -n 's/host: //p')"
+}
+
+build() {
+  cd "$pkgname-$pkgver"
+  export RUSTUP_TOOLCHAIN=stable
+  export CARGO_TARGET_DIR=target
+  cargo build --frozen --release
+}
+
+package() {
+  cd "$pkgname-$pkgver"
+  install -Dm755 "target/release/$pkgname" "$pkgdir/usr/bin/$pkgname"
+  install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}