From 6883dce24de06475d06b612d159e47709de0792e Mon Sep 17 00:00:00 2001
From: Senko-san <senko@Senko-sans-Mac-mini.local>
Date: Wed, 10 Jun 2026 13:36:36 +0300
Subject: [PATCH] build: force BuildKit in Makefile so RUN --mount cache works
 on Linux

Legacy Docker builders fall back without BuildKit and fail on
`RUN --mount=type=cache`. Export DOCKER_BUILDKIT and
COMPOSE_DOCKER_CLI_BUILD for all make targets.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile b/Makefile
index f563ad6..daf0230 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,11 @@
 
 COMPOSE := docker compose
 
+# Force BuildKit so `RUN --mount=type=cache` works everywhere (older/Linux
+# Docker engines otherwise fall back to the legacy builder and fail the build).
+export DOCKER_BUILDKIT := 1
+export COMPOSE_DOCKER_CLI_BUILD := 1
+
 .DEFAULT_GOAL := help
 .PHONY: help env up build rebuild down stop restart ps logs logs-api logs-webui \
         sh-api sh-webui db-shell redis-cli migrate makemigration downgrade \