feat: add etcd build

- create rpm for etcd, etcdctl and etcdutl
- manage systemd service for etcd

rpms/etcd/resources/scripts/postinstall.sh

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+systemctl daemon-reload

rpms/etcd/resources/scripts/postremove.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+rm -f /usr/lib/systemd/system/etcd.service
+systemctl daemon-reload

rpms/etcd/resources/scripts/preinstall.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+groupadd --system etcd
+useradd --system --shell /sbin/nologin --no-create-home --home-dir /var/lib/etcd --gid etcd etcd
+mkdir -p /var/lib/etcd
+chown etcd:etcd /var/lib/etcd

rpms/etcd/resources/scripts/preremove.sh

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+systemctl stop etcd.service