WIP: coverity: Make sure curl is installed, as our coverity upload job needs it

This is untested. I'm on the train and have very limited understanding
of Ansible

Change-Id: I9918b89971bf6c2e200f1d96d993d5fbd6741b71

jobs/coverity.yml

@@ -2,8 +2,18 @@
 - project:
     name: osmocom-coverity
     jobs:
+      - osmocom-coverity-deps
       - osmocom-coverity
 
+- job:
+    name: 'osmocom-coverity-deps'
+    apt:
+      name: "{{ item }}"
+      cache_valid_time: 3600
+      update_cache: yes
+    with_items:
+      - curl
+
 - job:
     name: 'osmocom-coverity'
     project-type: freestyle