ci: build and test every PR, release on tags, and add AUR packages (#15)

Co-authored-by: Tri Vo Khac <git@trivk.dev>

packaging/aur/update-pkgbuild.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Point the qtpotato PKGBUILD at a published release and regenerate .SRCINFO.
+#
+# Usage: packaging/aur/update-pkgbuild.sh <version>   (e.g. 0.2.0, after the v0.2.0 release)
+set -euo pipefail
+
+version="${1#v}"
+dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+url="https://git.trivk.dev/tri/QtPotato/releases/download/v$version"
+sum="$(curl -fsSL "$url/SHA256SUMS" | awk -v f="qtpotato-$version.tar.gz" '$2 == f { print $1 }')"
+[[ -n "$sum" ]] || { echo "qtpotato-$version.tar.gz not found in $url/SHA256SUMS" >&2; exit 1; }
+
+cd "$dir/qtpotato"
+sed -i -e "s/^pkgver=.*/pkgver=$version/" -e "s/^pkgrel=.*/pkgrel=1/" \
+    -e "s/^sha256sums=.*/sha256sums=('$sum')/" PKGBUILD
+makepkg --printsrcinfo > .SRCINFO
+cd "$dir/qtpotato-git"
+makepkg --printsrcinfo > .SRCINFO