fix copy/pasta error

root/etc/s6-overlay/s6-rc.d/svc-coredns/run

@@ -11,10 +11,10 @@ elif grep -q "health" /config/coredns/Corefile; then
     exec \
         s6-notifyoncheck -d -n 300 -w 1000 -c "redirfd -w 1 /dev/null curl -s http://localhost:8080/health" \
             cd /config/coredns \
-            /usr/bin/coredns -dns.port=53
+            /app/coredns -dns.port=53
 else
     exec \
         s6-notifyoncheck -d -n 300 -w 1000 -c "nc -zu localhost 53" \
             cd /config/coredns \
-            /usr/bin/coredns -dns.port=53
+            /app/coredns -dns.port=53
 fi