From 08254cf126b12c793af1570867f41885e85a8c9d Mon Sep 17 00:00:00 2001
From: silverwind <me@silverwind.io>
Date: Sun, 1 Mar 2026 22:18:46 +0100
Subject: [PATCH] Enable docker layer caching for `dry-run` and `nightly`
 container builds (#36738)

Enable Docker BuildKit layer caching for the dry-run and nightly
container build workflows using GHCR registry cache.

- **Dry-run** (`pull-docker-dryrun.yml`): adds `cache-from`, read-only,
PRs can't write cache
- **Nightly** (`release-nightly.yml`): adds `cache-from` and `cache-to`
to both read and write cach

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
---
 .github/workflows/pull-docker-dryrun.yml | 2 ++
 .github/workflows/release-nightly.yml    | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/.github/workflows/pull-docker-dryrun.yml b/.github/workflows/pull-docker-dryrun.yml
index 405521c354..bcc19e3eba 100644
--- a/.github/workflows/pull-docker-dryrun.yml
+++ b/.github/workflows/pull-docker-dryrun.yml
@@ -29,6 +29,7 @@ jobs:
           context: .
           platforms: linux/amd64,linux/arm64,linux/riscv64
           push: false
+          cache-from: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootful
       - name: Build rootless container image
         uses: docker/build-push-action@v6
         with:
@@ -36,3 +37,4 @@ jobs:
           push: false
           platforms: linux/amd64,linux/arm64,linux/riscv64
           file: Dockerfile.rootless
+          cache-from: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootless
diff --git a/.github/workflows/release-nightly.yml b/.github/workflows/release-nightly.yml
index f073df05d3..a7b2fda042 100644
--- a/.github/workflows/release-nightly.yml
+++ b/.github/workflows/release-nightly.yml
@@ -120,6 +120,8 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           annotations: ${{ steps.meta.outputs.annotations }}
+          cache-from: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootful
+          cache-to: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootful,mode=max
       - name: build rootless docker image
         uses: docker/build-push-action@v6
         with:
@@ -129,3 +131,5 @@ jobs:
           file: Dockerfile.rootless
           tags: ${{ steps.meta_rootless.outputs.tags }}
           annotations: ${{ steps.meta_rootless.outputs.annotations }}
+          cache-from: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootless
+          cache-to: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootless,mode=max