dist: include PKGBUILD from the AUR

This has been discussed in issue #4. Including the PKGBUILD in this
repository has the benefit of versioning it alongside the code, and
eventually pushing it to the AUR as part of the continuous integration
pipeline. -- Alexander Bauer

Author: jtojnar

dist/arch/PKGBUILD

@@ -0,0 +1,23 @@
+# Maintainer: Jan Tojnar <[email protected]>
+pkgname=tectonic
+pkgver=0.1.5
+pkgrel=2
+makedepends=('cargo')
+arch=('i686' 'x86_64')
+pkgdesc='modernized, complete, self-contained TeX/LaTeX engine, powered by XeTeX and TeXLive'
+url='https://tectonic-typesetting.github.io/en-US/'
+license=('MIT')
+depends=('fontconfig' 'harfbuzz-icu' 'openssl')
+source=("https://github.com/tectonic-typesetting/tectonic/archive/v${pkgver}/${pkgname}.tar.gz")
+sha256sums=('a493d6685cf63bea389c290677a641786f0b899e3e77fc7e865c8d1dcabc7aac')
+
+build() {
+	cd "$srcdir/$pkgname-$pkgver"
+	cargo build --release
+}
+
+package() {
+	cd "$srcdir/$pkgname-$pkgver"
+	mkdir -p "$pkgdir/usr/bin"
+	install "target/release/tectonic" "$pkgdir/usr/bin/tectonic"
+}