Feat/security env vars config (#105)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Enabled persistent n8n data storage in production via a mounted
volume.
* Allowed environment variable access within n8n nodes by default to
improve workflow flexibility.

* **Chores**
* Simplified environment configuration by removing an obsolete allowlist
variable in production settings.
* Updated default environment settings to align development and
production behavior.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: SashkoMarchuk

docker-compose.prod.yml

@@ -22,10 +22,10 @@ services:
       - N8N_BLOCKED_NODES=n8n-nodes-base.executeCommand,n8n-nodes-base.ssh
       - N8N_DEFAULT_BINARY_DATA_MODE=filesystem
       - N8N_BINARY_DATA_STORAGE_PATH=/data/n8n/binaryData
-      # Allowlist specific safe environment variables for node access
-      - N8N_ENV_ACCESS_ALLOWED=SEMBLY_USER,SEMBLY_PASS
       - SEMBLY_USER=${SEMBLY_USER:?SEMBLY_USER is required}
       - SEMBLY_PASS=${SEMBLY_PASS:?SEMBLY_PASS is required}
+    volumes:
+    - n8n_data:/data/n8n
   postgresql: !reset null
 
   temporal:

docker-compose.yml

@@ -28,8 +28,7 @@ services:
       - DB_POSTGRESDB_DATABASE=${POSTGRES_DB_N8N:-n8n}
       - DB_POSTGRESDB_USER=${POSTGRES_USER_N8N:-n8n}
       - DB_POSTGRESDB_PASSWORD=${POSTGRES_PASSWORD_N8N:-n8n_password}
-      # Block $env access in nodes for security (default: true)
-      - N8N_BLOCK_ENV_ACCESS_IN_NODE=true
+      - N8N_BLOCK_ENV_ACCESS_IN_NODE=false
       - SEMBLY_USER=${SEMBLY_USER:-sembly_user}
       - SEMBLY_PASS=${SEMBLY_PASS:-sembly_pass}
       - N8N_LOG_LEVEL=debug