Migrate OpenMapKit to S6 supervisor

openmapkit/Dockerfile

@@ -10,8 +10,8 @@ RUN \
  && apk --no-cache del paxctl
 
 RUN \
- # Install Python2 runtime
- apk --no-cache add python2
+ # Install runtime dependencies
+ apk --no-cache add python2 s6
 
 RUN \
  # Install build dependencies
@@ -34,9 +34,9 @@ RUN \
  && rm -rf /usr/local/share/.cache \
  && rm -rf /root/.cache /root/.config /root/.node-gyp /root/.npm
 
+COPY docker/ /
+
 VOLUME ["/srv/openmapkit/data"]
 EXPOSE 8080
 
-USER omk
-ENV NODE_ENV production
-CMD ["node", "/srv/openmapkit/server.js"]
+CMD ["s6-svscan", "/etc/services.d"]

openmapkit/docker/etc/services.d/.s6-svscan/finish

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+/bin/true

openmapkit/docker/etc/services.d/openmapkit/run

@@ -0,0 +1,6 @@
+#!/bin/execlineb -P
+
+fdmove -c 2 1
+export NODE_ENV production
+s6-setuidgid 8007:8007
+/usr/bin/node /srv/openmapkit/server.js