packager_alias: Allow for sporadic failures in retrieving info from dist-git

Basically, if we fail to retrieve data from pagure or we fail to
convert from JSON, wait for 30 seconds and retry.
If after two minutes (4 attempts) it still hasn't worked, bail.

Fixes https://pagure.io/fedora-infrastructure/issue/7603

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

roles/packager_alias/files/owner-email-from-pagure.py

@@ -6,6 +6,8 @@ This script is ran as a cronjob and bastion.
 Its goal is to generate all the <pkg>-owner email aliases we provide
 """
 
+import time
+
 import requests
 
 from requests.adapters import HTTPAdapter
@@ -36,8 +38,19 @@ def get_pagure_projects():
     pagure_projects_url = pagure_url + '/api/0/projects?page=1&per_page=100&fork=false'
     session = retry_session()
     while pagure_projects_url:
-        response = session.get(pagure_projects_url)
-        data = response.json()
+        cnt = 0
+        while True:
+            try:
+                response = session.get(pagure_projects_url)
+                data = response.json()
+                break
+            except Exception:
+                if cnt == 4:
+                    raise
+
+                cnt += 1
+                time.sleep(30)
+
         for project in data['projects']:
             yield project
         # This is set to None on the last page.