From 1c1d2d07f6e72fabb76ff968daff701720db1288 Mon Sep 17 00:00:00 2001
From: Valentin Brandl <vbrandl@riseup.net>
Date: Wed, 24 Apr 2019 00:28:54 +0200
Subject: [PATCH] Cache builder stage

---
 .gitlab-ci.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cffd741..9c2915f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,6 +9,7 @@ stages:
 variables:
   DOCKER_HOST: tcp://docker:2375
   DOCKER_DRIVER: overlay2
+  CONTAINER_BUILDER_IMAGE: $CI_REGISTRY_IMAGE:builder-latest
   CONTAINER_TEST_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
   CONTAINER_RELEASE_IMAGE: $CI_REGISTRY_IMAGE:latest
   CONTAINER_TAG_IMAGE: $CI_REGISTRY_IMAGE:${CI_COMMIT_TAG:1}
@@ -22,6 +23,8 @@ build:
     - docker pull $CONTAINER_TEST_IMAGE || true
     - docker pull $CONTAINER_RELEASE_IMAGE || true
     - docker pull $CONTAINER_TAG_IMAGE || true
+    - docker pull $CONTAINER_BUILDER_IMAGE || true
+    - docker build --pull -t $CONTAINER_BUILDER_IMAGE --target builder .
     - docker build --pull -t $CONTAINER_TEST_IMAGE .
     - docker push $CONTAINER_TEST_IMAGE