fix(docker): build blst images portably

Dockerfile

@@ -34,8 +34,9 @@ COPY --from=frontend /ui/dist /src/ui/dist
 ARG VERSION=dev
 ARG COMMIT=unknown
 ARG BUILD_DATE=unknown
+ARG CGO_CFLAGS="-O2 -D__BLST_PORTABLE__"
 
-RUN CGO_ENABLED=1 go build -trimpath \
+RUN CGO_ENABLED=1 CGO_CFLAGS="${CGO_CFLAGS}" go build -trimpath \
     -ldflags "-X github.com/strahe/synaps3/internal/buildinfo.Version=${VERSION} \
               -X github.com/strahe/synaps3/internal/buildinfo.Commit=${COMMIT} \
               -X github.com/strahe/synaps3/internal/buildinfo.Date=${BUILD_DATE}" \

compose.local.yaml

@@ -0,0 +1,8 @@
+services:
+  synaps3:
+    image: synaps3:local
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        VERSION: local

docs/en/getting-started/docker.md

@@ -14,6 +14,22 @@ The container stores runtime data under `/var/lib/synaps3`, exposes the S3 API o
 - SSH access if the dashboard is reached from another machine.
 - A Calibration wallet you can fund, or use the wallet steps below.
 
+## Choose the Image Source
+
+The default deployment uses the published image from `compose.yaml`. Continue with [Prepare Configuration](#prepare-configuration) to use it.
+
+### Build the Image from Source
+
+Install Git, then clone the full source tree and build the image:
+
+```bash
+git clone https://github.com/strahe/SynapS3.git
+cd SynapS3
+docker compose -f compose.yaml -f compose.local.yaml build --no-cache
+```
+
+When using the local image, skip the deployment directory and download commands in the next section. For every later command in this guide, replace `docker compose` with `docker compose -f compose.yaml -f compose.local.yaml`.
+
 ## Prepare Configuration
 
 Create a deployment directory with the Compose file:

docs/zh/getting-started/docker.md

@@ -14,6 +14,22 @@ description: 使用 Docker Compose 部署 SynapS3。
 - 如果从另一台机器访问仪表盘，需要 SSH 权限。
 - 可充值的 Calibration 钱包，或按下面步骤生成并充值。
 
+## 选择镜像来源
+
+默认部署使用 `compose.yaml` 中的发布镜像。使用发布镜像时，继续执行[准备配置](#准备配置)。
+
+### 从源码构建镜像
+
+需要在本地构建镜像时，先安装 Git，再克隆完整源码并构建：
+
+```bash
+git clone https://github.com/strahe/SynapS3.git
+cd SynapS3
+docker compose -f compose.yaml -f compose.local.yaml build --no-cache
+```
+
+使用本地镜像时，跳过下一节创建部署目录和下载文件的命令。执行本文后续命令时，将开头的 `docker compose` 替换为 `docker compose -f compose.yaml -f compose.local.yaml`。
+
 ## 准备配置
 
 创建部署目录，并下载 Compose 文件：