PR build status: re-try up to 3 times if it fails for some reason

Sometimes it happens that the task fail for some reason and people don't get the
PR status updated for RTD build. This commit adds a retry up to 3 times to avoid
these cases.

Closes #8177

Author: humitos

readthedocs/builds/tasks.py

@@ -346,7 +346,11 @@ def sync_versions_task(project_pk, tags_data, branches_data, **kwargs):
     return True
 
 
-@app.task(queue='web')
+@app.task(
+    max_retries=3,
+    default_retry_delay=60,
+    queue='web'
+)
 def send_build_status(build_pk, commit, status, link_to_build=False):
     """
     Send Build Status to Git Status API for project external versions.
@@ -367,7 +371,7 @@ def send_build_status(build_pk, commit, status, link_to_build=False):
 
     provider_name = build.project.git_provider_name
 
-    log.info('Sending build status. build=%s, project=%s', build.pk, build.project.slug)
+    log.info('Sending build status. build=%s project=%s', build.pk, build.project.slug)
 
     if provider_name in [GITHUB_BRAND, GITLAB_BRAND]:
         # get the service class for the project e.g: GitHubService.
@@ -445,7 +449,7 @@ def send_build_status(build_pk, commit, status, link_to_build=False):
             notification.send()
 
         log.info(
-            'No social account or repository permission available for %s',
+            'No social account or repository permission available. project=%s',
             build.project.slug
         )
         return False