From 4c1af406f734afc50a7a0e199af95231a61e8b33 Mon Sep 17 00:00:00 2001
From: Chris Evich <chris_gitlab@icuc.me>
Date: Mon, 5 Dec 2022 08:17:44 -0500
Subject: [PATCH] Cache prior build layers for ~5 days

This vastly improves build performance at the cost of some extra
registry server storage (which there is plenty of).   Note: The cache
TTL needs to be coordinated with the registry server's tag-cleanup
policy.

Signed-off-by: Chris Evich <chris_gitlab@icuc.me>
---
 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2d1cb20..cb87d73 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -47,6 +47,8 @@ build:
         echo "Building/Pushing to: ${CI_REGISTRY_IMAGE}:${IMAGE_TAG}";
     - >-
       buildah build \
+        --layers --cache-from "${CI_REGISTRY_IMAGE}" \
+        --cache-to "${CI_REGISTRY_IMAGE}" --cache-ttl=128h \
         --label "org.opencontainers.image.source=${CI_PROJECT_URL}" \
         --label "org.opencontainers.image.revision=$CI_COMMIT_SHA" \
         --label "org.opencontainers.image.created=$CI_JOB_STARTED_AT" \