From b65f268a7fa7e0dfa19153c792343a16aa9959b7 Mon Sep 17 00:00:00 2001
From: Devan Carpenter <dvn@pep-project.org>
Date: Tue, 8 Jun 2021 11:36:50 -0500
Subject: [PATCH] runner: add a docker prune crojob

old images tend to pile up, so we need to schedule a garbage collection.
---
 roles/gitlab-runner/tasks/main.yml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/roles/gitlab-runner/tasks/main.yml b/roles/gitlab-runner/tasks/main.yml
index ccbeed5..2838bfa 100644
--- a/roles/gitlab-runner/tasks/main.yml
+++ b/roles/gitlab-runner/tasks/main.yml
@@ -83,3 +83,10 @@
   with_items:
     - gitlab-runner
   when: ansible_local.gitlab_runner.executor == "docker"
+
+- name: Install Docker garbage collection cronjob
+  cron:
+    user: "gitlab-runner"
+    name: "Docker GC"
+    hour: "3"
+    job: "docker system prune -f && docker system prune -f --volumes"