Add dockerized version

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

Dockerfile

@@ -0,0 +1,22 @@
+FROM golang:alpine
+
+LABEL maintainer "Knut Ahlers <knut@ahlers.me>"
+
+ADD . /go/src/github.com/Luzifer/nginx-sso
+WORKDIR /go/src/github.com/Luzifer/nginx-sso
+
+RUN set -ex \
+ && apk --no-cache add git ca-certificates bash curl \
+ && go install -ldflags "-X main.version=$(git describe --tags || git rev-parse --short HEAD || echo dev)" \
+ && curl -sSfLo /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.1/dumb-init_1.2.1_amd64 \
+ && chmod +x /usr/local/bin/dumb-init \
+ && apk --no-cache del --purge git curl
+
+EXPOSE 8082
+
+VOLUME ["/data"]
+
+ADD docker-start.sh /usr/local/bin
+
+ENTRYPOINT ["/usr/local/bin/docker-start.sh"]
+CMD ["--"]

docker-start.sh

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+#!/usr/local/bin/dumb-init /bin/bash
+set -euo pipefail
+
+# Copy frontend if not available
+[ -d /data/frontend ] || cp -r /go/src/github.com/Luzifer/nginx-sso/frontend /data/frontend
+
+[ -e /data/config.yaml ] || {
+  cp /go/src/github.com/Luzifer/nginx-sso/config.yaml /data/config.yaml
+  echo "An example configuration was copied to /data/config.yaml - You want to edit that one!"
+  exit 1
+}
+
+echo "Starting nginx-sso"
+exec /go/bin/nginx-sso \
+  --config /data/config.yaml \
+  --frontend-dir /data/frontend \
+  $@