create docker compose setup

src/random_access/settings.py

@@ -1,8 +1,29 @@
+"""
+Settings configuration that works in both local development and Docker environments.
+
+In local development:
+- Loads from .env file if it exists
+- Environment variables override .env file values
+
+In Docker:
+- Reads directly from environment variables (no .env file needed)
+- Use docker-compose.yml or docker run -e to set environment variables
+"""
+
+import os
+from os import environ
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class Settings(BaseSettings):
-    model_config = SettingsConfigDict(env_file='.env', env_file_encoding='utf-8', extra='ignore')
+    model_config = SettingsConfigDict(
+        # Try to load .env file for local development, but don't fail if it doesn't exist
+        env_file='.env' if os.path.exists('.env') else None,
+        env_file_encoding='utf-8',
+        extra='ignore',
+        # Environment variables take precedence over .env file
+        env_ignore_empty=True
+    )
     airtable_pat: str
     airtable_base: str
     slack_signing_secret: str
@@ -20,10 +41,21 @@ class Settings(BaseSettings):
     # Session security
     session_ttl_hours: int = 24  # Session expires after 24 hours
     
+    # Redis/Valkey settings - prioritize explicit env vars, fall back to container detection
+    redis_host: str = environ.get("REDIS_HOST") or (
+        "valkey" if environ.get("DOCKER_CONTAINER") else "localhost"
+    )
+    redis_port: int = int(environ.get("REDIS_PORT", "6379"))
+    
     @property
     def is_production(self) -> bool:
         return self.environment == "production"
     
+    @property 
+    def is_container(self) -> bool:
+        """Detect if running in a container environment."""
+        return bool(environ.get("DOCKER_CONTAINER") or environ.get("REDIS_HOST"))
+    
     @property
     def origins_list(self) -> list[str]:
         if self.allowed_origins == "*":