chore: update Dockerfile to install pnpm globally and modify Gitea CI/CD workflow to specify platform

.gitea/workflows/build.yml

@@ -44,5 +44,6 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=local,src=/cache
           cache-to: type=local,dest=/cache,mode=max
-          platforms: linux/amd64,linux/arm64
+          # platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64
 

Dockerfile

@@ -2,7 +2,7 @@
 FROM node:22-alpine AS builder
 
 # 安装 pnpm
-RUN corepack enable && corepack prepare pnpm@latest --activate
+RUN npm install -g pnpm
 
 # 设置工作目录
 WORKDIR /app