feat: add frp docker compose setup

frp/frpc/.env.sample

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+# Copy this file to .env and adjust the values:
+#     cp .env.sample .env
+
+FRPS_SERVER_ADDR=your-server-ip-or-domain
+FRPS_SERVER_PORT=7000
+
+# Must match the token on frps. Use a long random string, e.g. `openssl rand -hex 16`
+FRPS_TOKEN=change-me-to-a-strong-random-token
+
+TZ=Asia/Shanghai

frp/frpc/docker-compose.yml

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

frp/frpc/frpc.toml

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+# {{ .Envs.XXX }} values are rendered from environment variables at startup
+serverAddr = "{{ .Envs.FRPS_SERVER_ADDR }}"
+serverPort = {{ .Envs.FRPS_SERVER_PORT }}
+
+# Token must match the one configured on frps
+auth.method = "token"
+auth.token = "{{ .Envs.FRPS_TOKEN }}"
+
+# Admin UI (optional) - http://127.0.0.1:7400
+webServer.addr = "127.0.0.1"
+webServer.port = 7400
+
+# Proxies: the tunnels to create. Edit / add entries for your own services.
+
+# Example: expose local SSH (port 22) as <frps-server>:6000
+[[proxies]]
+name = "ssh"
+type = "tcp"
+localIP = "127.0.0.1"
+localPort = 22
+remotePort = 6000
+
+# Example: expose a local web service (port 8080) as <frps-server>:8080
+[[proxies]]
+name = "web"
+type = "tcp"
+localIP = "127.0.0.1"
+localPort = 8080
+remotePort = 8080