Add plugin support and update to caddy v0.10.2

Dockerfile

@@ -4,31 +4,38 @@ MAINTAINER Jan Christian Grünhage <mail@janchristiangruenhage.de>
 ENV GOPATH /gopath
 ENV CADDY_REPO_OWNER mholt
 ENV CADDY_REPO_NAME caddy
-ENV CADDY_BRANCH tags/v0.9.5
+ENV CADDY_BRANCH tags/v0.10.2
 ENV CADDYPATH /caddy
 ENV UID 192
 ENV GID 192
 
-RUN addgroup -g $GID -S caddy \
-	&& adduser -u $UID -g $GID -S caddy
+COPY plugins.txt /plugins
 
 RUN apk add --update musl \
-	&& apk add --no-cache build-base libcap tini go git \
+	&& apk add --no-cache build-base su-exec libcap tini go git \
 	&& mkdir -p $GOPATH/src/github.com/$CADDY_REPO_OWNER \
 	&& cd $GOPATH/src/github.com/$CADDY_REPO_OWNER \
 	&& git clone https://github.com/$CADDY_REPO_OWNER/$CADDY_REPO_NAME \
 	&& cd $CADDY_REPO_NAME \
 	&& git checkout $CADDY_BRANCH \
+	&& cd caddy/caddymain \
+	&& export line="$(grep -n "// This is where other plugins get plugged in (imported)" < run.go | sed 's/^\([0-9]\+\):.*$/\1/')" \
+	&& head -n ${line} run.go > newrun.go \
+	&& cat /plugins >> newrun.go \
+	&& line=`expr $line + 1` \
+	&& tail -n +${line} run.go >> newrun.go \
+	&& rm -f run.go \
+	&& mv newrun.go run.go \
 	&& go get github.com/$CADDY_REPO_OWNER/$CADDY_REPO_NAME/... \
 	&& mv $GOPATH/bin/caddy /usr/bin \
 	&& setcap cap_net_bind_service=+ep /usr/bin/caddy \
 	&& apk del --purge build-base go \
 	&& mkdir $CADDYPATH \
-	&& rm -rf $GOPATH /var/cache/apk/*
+	&& rm -rf $GOPATH /var/cache/apk/* /plugins
+
+COPY root /
 
-USER		caddy
 EXPOSE		2015 80 443
-VOLUME		[ "$CADDYPATH" ]
+VOLUME		["$CADDYPATH" ]
 WORKDIR		"$CADDYPATH"
-ENTRYPOINT	[ "/sbin/tini" ]
-CMD		[ "caddy", "-quic", "--conf", "/caddy/Caddyfile" ]
+ENTRYPOINT	["/sbin/tini", "--", "/usr/local/bin/run.sh"]

plugins.txt

@@ -0,0 +1 @@
+	_ "github.com/abiosoft/caddy-git"

root/usr/local/bin/run.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+chown -R ${UID}:${GID} /caddy
+exec su-exec ${UID}:${GID} /usr/bin/caddy -quic --conf /caddy/Caddyfile