Dockerfile: Reduce healthcheck interval to 1s (it's cheap)

Signed-off-by: Erik Hollensbe <[email protected]>

Dockerfile.release

@@ -22,7 +22,7 @@ RUN rm -rf /var/lib/zerotier-one
 COPY entrypoint.sh.release /entrypoint.sh
 RUN chmod 755 /entrypoint.sh
 
-HEALTHCHECK CMD bash /healthcheck.sh
+HEALTHCHECK --interval=1s CMD bash /healthcheck.sh
 
 CMD []
 ENTRYPOINT ["/entrypoint.sh"]