testing/etcd: improving download the config file

using pkgver with substring, there's not need to modify the source
file for  default config

testing/etcd/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Francesco Colista <fcolista@alpinelinux.org>
 pkgname=etcd
 pkgver=3.4.3
-pkgrel=1
+pkgrel=2
 pkgdesc="A highly-available key value store for shared configuration and service discovery"
 url="https://github.com/coreos/etcd"
 arch="x86_64 ppc64le"
@@ -13,7 +13,7 @@ pkgusers="$pkgname"
 pkggroups="$pkgname"
 subpackages="$pkgname-doc $pkgname-ctl $pkgname-openrc"
 source="$pkgname-$pkgver.tar.gz::https://github.com/coreos/etcd/archive/v$pkgver.tar.gz
-	$pkgname.yaml::https://raw.githubusercontent.com/etcd-io/etcd/release-3.4/etcd.conf.yml.sample
+	$pkgname.yaml::https://raw.githubusercontent.com/etcd-io/etcd/release-${pkgver%.*}/etcd.conf.yml.sample
 	$pkgname.confd
 	$pkgname.initd
 	"