Add OpenRC init scripts for bootstrapping Alpine Linux from Git

pkg/alpine/README.rst

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+========================
+Support for Alpine Linux
+========================
+
+This directory contains initialization scripts for Salt services which intended
+to be used during the bootstrap process on Alpine Linux (OpenRC init system).

pkg/alpine/salt-api

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+#!/sbin/openrc-run
+command="/usr/bin/salt-api"
+command_args="--daemon"
+pidfile="/var/run/salt-api.pid"
+name="Salt API daemon"
+
+depend() {
+	need localmount
+	use net
+	after bootmisc
+}

pkg/alpine/salt-master

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+#!/sbin/openrc-run
+command="/usr/bin/salt-master"
+command_args="--daemon"
+pidfile="/var/run/salt-master.pid"
+name="Salt Master"
+
+depend() {
+	need localmount
+	use net
+	after bootmisc
+}

pkg/alpine/salt-minion

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+#!/sbin/openrc-run
+command="/usr/bin/salt-minion"
+command_args="--daemon"
+pidfile="/var/run/salt-minion.pid"
+name="Salt Minion"
+
+depend() {
+	need localmount
+	use net
+	after bootmisc
+}

pkg/alpine/salt-syndic

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+#!/sbin/openrc-run
+command="/usr/bin/salt-syndic"
+command_args="--daemon"
+pidfile="/var/run/salt-syndic.pid"
+name="Salt Syndic"
+
+depend() {
+	need localmount
+	use net
+	after bootmisc
+}