From 846288731f51dafaf53b9a862129f94bd7dfb928 Mon Sep 17 00:00:00 2001
From: wonder <hezhaohui0807@163.com>
Date: Sun, 21 Jun 2026 14:20:34 +0800
Subject: [PATCH] perf: add BuildKit cache mounts to speed up Go build in
 Docker

Mount persistent cache for go build and module directories so
subsequent builds only recompile changed packages.
---
 Dockerfile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 2fc4d0a..9c3991e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 # Build stage
 FROM golang:1.25-alpine AS builder
 WORKDIR /app
@@ -5,7 +6,9 @@ COPY go.mod go.sum ./
 ENV GOPROXY=https://goproxy.cn,direct
 RUN go mod download
 COPY . .
-RUN CGO_ENABLED=0 go build -o pr-helper .
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    --mount=type=cache,target=/go/pkg/mod \
+    CGO_ENABLED=0 go build -o pr-helper .
 
 # Runtime stage
 FROM alpine:3.20