feat(infra-gitops): add suspend logic for infra-gitops-post based on environment variables

.env.sample

@@ -6,6 +6,10 @@ S3_ACCESS_SECRET_KEY=placeholder
 DNSPOD_SECRET_ID=placeholder
 DNSPOD_SECRET_KEY=placeholder
 
+# Infra GitOps Post 阶段开关（参见 flux/README.md） 
+# 如果开启 需要完善 GITEA_ACTIONS_TOKEN / FLUX_WEB_OIDC_CLIENT_ID / FLUX_WEB_OIDC_CLIENT_SECRET 三个变量
+INFRA_GITOPS_POST_SUSPEND=true
+
 # Gitea Actions Runner Token（Gitea 启动后在 admin → Runners 生成）
 GITEA_ACTIONS_TOKEN=placeholder