docker: add an healthcheck for ipinfo updater container

We could add a dependency of the orchestrator on it, but it may break
some setups. We'll see later.

docker/docker-compose-ipinfo.yml

@@ -10,3 +10,8 @@ services:
       - UPDATE_FREQUENCY=48h
     volumes:
       - akvorado-geoip:/data
+    healthcheck:
+      interval: 10s
+      timeout: 10s
+      retries: 0
+      test: ["CMD", "test", "-f", "/tmp/healthy"]

docker/ipinfo-geoipupdate.sh

@@ -3,6 +3,7 @@
 trap exit TERM
 
 while true; do
+    ok=1
     for DATABASE in ${IPINFO_DATABASES}; do
         if [ -f ${DATABASE}.mmdb ]; then
             # Is it up-to-date?
@@ -29,10 +30,12 @@ while true; do
             *)
                 echo "Failed to download ${DATABASE}.mmdb database (HTTP error $RESPONSE)."
                 rm "${DATABASE}.mmdb.new" 2> /dev/null
+                ok=0
                 ;;
         esac
     done
 
+    [ $ok -eq 1 ] && touch /tmp/healthy
     sleep "$UPDATE_FREQUENCY" &
     wait $!
 done