Add arch linux installer submodule, upgrade to v0.12.2

.gitmodules

+[submodule "installers/linux/archlinux/minikube"]
+	name = archlinux
+	path = installers/linux/archlinux/minikube
+	url = https://aur.archlinux.org/minikube.git

installers/linux/PKGBUILD

-# vim: ts=2 sts=2 sw=2 et ft=sh
-# Maintainer: 
-
-pkgname=minikube
-pkgver=0.11.0
-pkgrel=1
-pkgdesc="Minikube is a tool that makes it easy to run Kubernetes locally"
-url="https://github.com/kubernetes/minikube"
-license=('Apache')
-arch=('x86_64')
-depends=(
-  'virtualbox'
-  'net-tools'
-)
-optdepends=(
-  'kubectl-bin: to manage the cluster'
-)
-makedepends=()
-
-source=(minikube_$pkgver::https://storage.googleapis.com/minikube/releases/v$pkgver/minikube-linux-amd64)
-sha512sums=('93f3235db5b9fc464c9fb62b6de47744ccbbd5cd16f80b6bbaf1a46ea774b9edf67d35cf4b3478e1a9bfaedb9976fc44d453a93967e6954e9b8ee991b144bf06')
-
-package() {
-  cd "$srcdir"
-  install -d "$pkgdir/usr/bin"
-  install -m755 minikube_$pkgver "$pkgdir/usr/bin/minikube"
-}

minikube @ 619a4c6d

+Subproject commit 619a4c6d4c3b1f78d885172e5369abd0999c08f1