fixes to curl commands

docker/netdisco-base/Dockerfile

@@ -9,6 +9,7 @@ RUN bash -c 'mkdir -p /usr/share/man/man{1..8}' && \
     apt-get -yq update && \
     apt-get install -yq --no-install-recommends \
       build-essential \
+      ca-certificates \
       cpanminus \
       curl \
       git \

docker/netdisco-base/hooks/post_push

@@ -1,4 +1,4 @@
 #!/bin/bash
 for url in $(echo $BUILD_TRIGGERS | sed "s/,/ /g"); do
-  curl -X POST -H "Content-Type: application/json" --data "{ \"build\": true, \"source_name\": \"$SOURCE_BRANCH\" }" $url
+  curl -sL -X POST -H "Content-Type: application/json" --data "{ \"build\": true, \"source_name\": \"$SOURCE_BRANCH\" }" $url
 done