add AUR publish support

packaging/aur/README.md

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+# AUR publishing
+
+This repository includes an automated AUR publish workflow:
+- package files: `packaging/aur/dcr/PKGBUILD`, `packaging/aur/dcr/.SRCINFO`
+- workflow: `.github/workflows/aur.yml`
+
+## One-time setup
+
+1. Create the `dcr` package on AUR and initialize its git repository.
+2. Create an SSH key pair for CI.
+3. Add the public key to your AUR account.
+4. Add the private key to GitHub Actions secret `AUR_SSH_PRIVATE_KEY`.
+
+## Release flow
+
+1. Bump project version in `Cargo.toml`.
+2. Push tag `v<version>` (example: `v0.2.2`).
+3. GitHub Actions will:
+- compute source tarball SHA256
+- render `PKGBUILD` and `.SRCINFO`
+- push updates to `ssh://aur@aur.archlinux.org/dcr.git`

packaging/aur/dcr/.SRCINFO

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+pkgbase = dcr
+	pkgdesc = Cargo-like utility to manage C/C++ projects
+	pkgver = 0.2.1
+	pkgrel = 1
+	url = https://github.com/dexoron/dcr
+	arch = x86_64
+	arch = aarch64
+	license = MIT
+	makedepends = cargo
+	depends = gcc-libs
+	optdepends = gcc: build C/C++ projects with GCC
+	optdepends = clang: build C/C++ projects with Clang
+	source = dcr-0.2.1.tar.gz::https://github.com/dexoron/dcr/archive/refs/tags/v0.2.1.tar.gz
+	sha256sums = 30e334fa98cd51073c0fa84c80a982584b00156b57084311ad53419441ce6235
+
+pkgname = dcr

packaging/aur/dcr/PKGBUILD

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+pkgname=dcr
+pkgver=0.2.1
+pkgrel=1
+pkgdesc="Cargo-like utility to manage C/C++ projects"
+arch=('x86_64' 'aarch64')
+url="https://github.com/dexoron/dcr"
+license=('MIT')
+depends=('gcc-libs')
+makedepends=('cargo')
+optdepends=(
+  'gcc: build C/C++ projects with GCC'
+  'clang: build C/C++ projects with Clang'
+)
+source=("$pkgname-$pkgver.tar.gz::$url/archive/refs/tags/v$pkgver.tar.gz")
+sha256sums=('30e334fa98cd51073c0fa84c80a982584b00156b57084311ad53419441ce6235')
+
+build() {
+  cd "$srcdir/$pkgname-$pkgver"
+  cargo build --release --locked
+}
+
+package() {
+  cd "$srcdir/$pkgname-$pkgver"
+  install -Dm755 "target/release/dcr" "$pkgdir/usr/bin/dcr"
+  install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}