change default user and use supervisor

Dockerfile

@@ -12,12 +12,21 @@ RUN apk add --no-cache -t build-deps git gcc musl-dev go \
 # Run go-neb
 FROM alpine:3.7
 
-ENV BIND_ADDRESS=:4050 DATABASE_TYPE=sqlite3 DATABASE_URL=/data/go-neb.db?_busy_timeout=5000
+ENV BIND_ADDRESS=:4050 \
+    DATABASE_TYPE=sqlite3 \
+    DATABASE_URL=/data/go-neb.db?_busy_timeout=5000 \
+    UID=1337 \
+    GID=1337
 
-COPY --from=builder /tmp/go-neb/bin/go-neb /go-neb
-RUN apk add --no-cache ca-certificates
+COPY --from=builder /tmp/go-neb/bin/go-neb /usr/local/bin/go-neb
+RUN apk add --no-cache \
+      ca-certificates \
+      su-exec \
+      s6
 
 VOLUME /data
 EXPOSE 4050
 
-ENTRYPOINT ["/go-neb"]
+COPY docker/root /
+
+ENTRYPOINT ["/bin/s6-svscan", "/etc/s6.d/"]

docker/root/etc/s6.d/.s6-svscan/finish

@@ -0,0 +1 @@
+#!/bin/sh

docker/root/etc/s6.d/go-neb/finish

@@ -0,0 +1 @@
+#!/bin/sh

docker/root/etc/s6.d/go-neb/run

@@ -0,0 +1,3 @@
+#!/bin/sh
+chown -R ${UID}:${GID} /data
+exec su-exec ${UID}:${GID} /usr/local/bin/go-neb