修复docker构建的问题

.env.example

@@ -1,6 +1,14 @@
 # HTTP server
 FIRE_SAFETY_HTTP_ADDR=:8080
 
+# Build-time Go module proxy (not a runtime secret). Compose defaults to the
+# official Go proxy with a direct, checksum-verified VCS fallback when this is
+# empty or omitted. On a test server that cannot reach proxy.golang.org, set
+# this to an approved reachable proxy, for example:
+# FIRE_SAFETY_BUILD_GOPROXY=https://<approved-go-proxy>,direct
+# Do not set GOPROXY=off or disable GOSUMDB/checksum verification.
+FIRE_SAFETY_BUILD_GOPROXY=https://proxy.golang.org,direct
+
 # SuperAgent Open API (disabled until a project-specific test credential is supplied)
 FIRE_SAFETY_SUPERAGENT_ENABLED=false
 # Required when enabled, for example: https://superagent.example.com