Feature: faster healthcheck, fix #283

Dockerfile

@@ -118,7 +118,7 @@ ENV VPNSP=pia \
     UPDATER_PERIOD=0
 ENTRYPOINT ["/entrypoint"]
 EXPOSE 8000/tcp 8888/tcp 8388/tcp 8388/udp
-HEALTHCHECK --interval=10m --timeout=10s --start-period=30s --retries=2 CMD /entrypoint healthcheck
+HEALTHCHECK --interval=5s --timeout=5s --start-period=10s --retries=1 CMD /entrypoint healthcheck
 RUN apk add -q --progress --no-cache --update openvpn ca-certificates iptables ip6tables unbound tzdata && \
     rm -rf /var/cache/apk/* /etc/unbound/* /usr/sbin/unbound-* && \
     deluser openvpn && \