add s6 services to distrib

distrib/s6/README

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+This directory contains s6 srv and log services for ergo.
+
+These services expect that ergo is installed to /opt/ergo,
+and an ergo system user that owns /opt/ergo.
+
+To install:
+	cp -r ergo-srv ergo-log /etc/s6/sv/
+	cp ergo.conf /etc/s6/config/

distrib/s6/ergo-log/consumer-for

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+ergo-srv

distrib/s6/ergo-log/notification-fd

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+3

distrib/s6/ergo-log/pipeline-name

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+ergo

distrib/s6/ergo-log/run

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+#!/usr/bin/execlineb -P
+envfile /etc/s6/config/ergo.conf
+importas -sCiu DIRECTIVES DIRECTIVES
+ifelse { test -w /var/log } {
+	foreground { install -d -o s6log -g s6log /var/log/ergo }
+	s6-setuidgid s6log exec -c s6-log -d3 -b -- ${DIRECTIVES} /var/log/ergo
+}
+foreground { install -d -o s6log -g s6log /run/log/ergo }
+s6-setuidgid s6log exec -c s6-log -d3 -b -- ${DIRECTIVES} /run/log/ergo

distrib/s6/ergo-log/type

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+longrun

distrib/s6/ergo-srv/producer-for

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+ergo-log

distrib/s6/ergo-srv/run

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+#!/usr/bin/execlineb -P
+fdmove -c 2 1
+execline-cd /opt/ergo
+s6-setuidgid ergo ./ergo run

distrib/s6/ergo-srv/type

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+longrun

distrib/s6/ergo.conf

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+# This configures the directives used for s6-log in the log service.
+DIRECTIVES="n3 s2000000"