Update how keys are fetched

See: nodejs/docker-node#2252

Author: chorrell

14/Dockerfile

@@ -15,7 +15,8 @@ RUN set -ex \
     108F52B48DB57BB0CC439B2997B01419BD92F80A \
     B9E2F5981AA6E0CD28160D9FF13993A75599653C \
   ; do \
-    gpg --batch --keyserver hkps://keys.openpgp.org  --recv-keys "$key" ; \
+    { gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys "$key" && gpg --batch --fingerprint "$key"; } || \
+    { gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "$key" && gpg --batch --fingerprint "$key"; } ; \
   done
 
 ENV NPM_CONFIG_LOGLEVEL info