Add dockerized version

Signed-off-by: Knut Ahlers <knut@ahlers.me>

Dockerfile

@@ -0,0 +1,47 @@
+FROM golang:alpine as builder
+
+ENV GO111MODULE=on
+
+COPY . /go/src/github.com/Luzifer/wiki
+WORKDIR /go/src/github.com/Luzifer/wiki
+
+RUN set -ex \
+ && apk add --update \
+      curl \
+      git \
+ && go build \
+      -ldflags "-X main.version=$(git describe --tags --always || echo dev)" \
+      -mod=readonly \
+      -o /go/bin/wiki
+
+RUN set -ex \
+ && curl -sSfLo /usr/local/bin/dumb-init "https://github.com/Yelp/dumb-init/releases/download/v1.2.2/dumb-init_1.2.2_amd64" \
+ && curl -sSfLo /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/1.11/gosu-amd64" \
+ && chmod +x \
+      /usr/local/bin/dumb-init \
+      /usr/local/bin/gosu
+
+FROM alpine:latest
+
+ENV DATA_DIR=/data
+
+LABEL maintainer "Knut Ahlers <knut@ahlers.me>"
+
+RUN set -ex \
+ && apk --no-cache add \
+      bash \
+      ca-certificates \
+ && adduser -D -h /home/wiki -S -u 1000 wiki
+
+COPY                docker-entrypoint.sh      /usr/local/bin/docker-entrypoint
+COPY --from=builder /go/bin/wiki              /usr/local/bin/wiki
+COPY --from=builder /usr/local/bin/dumb-init  /usr/local/bin/dumb-init
+COPY --from=builder /usr/local/bin/gosu       /usr/local/bin/gosu
+
+EXPOSE 3000
+VOLUME ["/data"]
+
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint"]
+CMD ["--"]
+
+# vim: set ft=Dockerfile:

docker-entrypoint.sh

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+#!/usr/local/bin/dumb-init /bin/bash
+set -euo pipefail
+
+chown wiki: "${DATA_DIR}"
+
+exec gosu wiki /usr/local/bin/wiki