feat(server): Override PG password in dockerfile (#148)

reverted previously by mistake.

Author: lan17

README.md

@@ -75,6 +75,15 @@ export AGENT_CONTROL_DB_HOST_PORT=15432
 curl -L https://raw.githubusercontent.com/agentcontrol/agent-control/refs/heads/main/docker-compose.yml | docker compose -f - up -d
 ```
 
+To override the bundled PostgreSQL password, set
+`AGENT_CONTROL_POSTGRES_PASSWORD` before starting Compose. This value is used
+for both the Postgres container and the server's database connection. Example:
+
+```bash
+export AGENT_CONTROL_POSTGRES_PASSWORD=agent_control_local
+curl -L https://raw.githubusercontent.com/agentcontrol/agent-control/refs/heads/main/docker-compose.yml | docker compose -f - up -d
+```
+
 Verify it is up:
 
 ```bash

docker-compose.yml

@@ -3,6 +3,7 @@
 # Quick Start:
 #   docker compose up -d
 #   AGENT_CONTROL_SERVER_HOST_PORT=18000 AGENT_CONTROL_DB_HOST_PORT=15432 docker compose up -d
+#   AGENT_CONTROL_POSTGRES_PASSWORD=agent_control_local docker compose up -d
 #
 # Services:
 #   - PostgreSQL database (port 5432)
@@ -26,7 +27,7 @@ services:
     environment:
       POSTGRES_DB: agent_control
       POSTGRES_USER: agent_control
-      POSTGRES_PASSWORD: agent_control
+      POSTGRES_PASSWORD: "${AGENT_CONTROL_POSTGRES_PASSWORD:-agent_control}"
     volumes:
       - pgdata:/var/lib/postgresql/data
     healthcheck:
@@ -45,7 +46,7 @@ services:
     environment:
       # Database connection (uses Docker service name 'postgres')
       # Use postgresql+psycopg:// (supports both sync migrations and async app code)
-      AGENT_CONTROL_DB_URL: postgresql+psycopg://agent_control:agent_control@postgres:5432/agent_control
+      AGENT_CONTROL_DB_URL: "postgresql+psycopg://agent_control:${AGENT_CONTROL_POSTGRES_PASSWORD:-agent_control}@postgres:5432/agent_control"
       # Server configuration
       AGENT_CONTROL_HOST: 0.0.0.0
       AGENT_CONTROL_PORT: 8000