feat: add frp docker compose setup

frp/frps/.env.sample

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+# Copy this file to .env and adjust the values:
+#     cp .env.sample .env
+
+FRPS_BIND_PORT=7000
+
+# Must match the token on frpc. Use a long random string, e.g. `openssl rand -hex 16`
+FRPS_TOKEN=change-me-to-a-strong-random-token
+
+FRPS_DASHBOARD_PORT=7500
+FRPS_DASHBOARD_USER=admin
+FRPS_DASHBOARD_PASSWORD=change-me-too
+
+TZ=Asia/Shanghai

frp/frps/docker-compose.yml

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+services:
+  frps:
+    image: snowdreamtech/frps:latest
+    container_name: frps
+    restart: unless-stopped
+    network_mode: host
+    env_file:
+      - .env
+    environment:
+      TZ: ${TZ:-Asia/Shanghai}
+    volumes:
+      - ./frps.toml:/etc/frp/frps.toml:ro

frp/frps/frps.toml

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+# {{ .Envs.XXX }} values are rendered from environment variables at startup
+bindPort = {{ .Envs.FRPS_BIND_PORT }}
+
+# Token must match the one configured on frpc
+auth.method = "token"
+auth.token = "{{ .Envs.FRPS_TOKEN }}"
+
+# Web dashboard (optional) - http://<server>:7500
+webServer.addr = "0.0.0.0"
+webServer.port = {{ .Envs.FRPS_DASHBOARD_PORT }}
+webServer.user = "{{ .Envs.FRPS_DASHBOARD_USER }}"
+webServer.password = "{{ .Envs.FRPS_DASHBOARD_PASSWORD }}"