Update environment configuration for MN Service credentials in n8n (#108)

- Added new environment variables for Sembly and Google Service Account
credentials.
- Updated configuration files to include new MN Service environment
variables for seamless integration.

These changes improve the n8n service by providing required credentials
for MN Service integration.

## Additional descriptions:
I created this PR to enable **Domain-Wide Delegation (DWD)** in Google
Workspace, allowing **n8n** to update event descriptions across all
users in the company calendar.
This setup is required to automatically insert the **Meeting Resources**
section into event descriptions for every scheduled call.

**Changes made:**
- Added a new environment variable containing the **Google Service
Account JSON** credentials.

**Task:** [#65518 MN Service. Investigate Google Calendar Event Update
for Meeting Resources (All
Attendees)](https://redmine.gluzdov.com/issues/65518)

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

* **Chores**
  * Added Sembly service credentials to configuration files.
* Added Google Service Account credential variables for the MN service
to Docker Compose and environment setup.
* Updated both development and production Docker Compose configurations
and example environment files with new credential variables.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: SashkoMarchuk

.env.example

@@ -77,3 +77,21 @@ N8N_SMTP_PASS=
 N8N_SMTP_SENDER=
 N8N_SMTP_SSL=false
 N8N_SMTP_TLS=true
+
+# MN Service credentials
+## Sembly credentials
+SEMBLY_USER=sembly_user
+SEMBLY_PASS=sembly_pass
+
+## MN Service — Google Service Account (SA)
+MN_SERVICE_SA_GOOGLE_TYPE=service_account
+MN_SERVICE_SA_GOOGLE_PROJECT_ID=mock-project-id
+MN_SERVICE_SA_GOOGLE_PRIVATE_KEY_ID=mock-private-key-id
+MN_SERVICE_SA_GOOGLE_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----\nMOCK_PRIVATE_KEY_CONTENT\n-----END PRIVATE KEY-----\n"
+MN_SERVICE_SA_GOOGLE_CLIENT_EMAIL=mock-service-account@mock-project-id.iam.gserviceaccount.com
+MN_SERVICE_SA_GOOGLE_CLIENT_ID=000000000000000000000
+MN_SERVICE_SA_GOOGLE_AUTH_URI=https://accounts.google.com/o/oauth2/auth
+MN_SERVICE_SA_GOOGLE_TOKEN_URI=https://oauth2.googleapis.com/token
+MN_SERVICE_SA_GOOGLE_AUTH_PROVIDER_X509_CERT_URL=https://www.googleapis.com/oauth2/v1/certs
+MN_SERVICE_SA_GOOGLE_CLIENT_X509_CERT_URL=https://www.googleapis.com/robot/v1/metadata/x509/mock-service-account%40mock-project-id.iam.gserviceaccount.com
+MN_SERVICE_SA_GOOGLE_UNIVERSE_DOMAIN=googleapis.com

docker-compose.prod.yml

@@ -24,6 +24,18 @@ services:
       - N8N_BINARY_DATA_STORAGE_PATH=/data/n8n/binaryData
       - SEMBLY_USER=${SEMBLY_USER:?SEMBLY_USER is required}
       - SEMBLY_PASS=${SEMBLY_PASS:?SEMBLY_PASS is required}
+      # Google Service Account variables
+      - MN_SERVICE_SA_GOOGLE_TYPE=${MN_SERVICE_SA_GOOGLE_TYPE:?MN_SERVICE_SA_GOOGLE_TYPE is required}
+      - MN_SERVICE_SA_GOOGLE_PROJECT_ID=${MN_SERVICE_SA_GOOGLE_PROJECT_ID:?MN_SERVICE_SA_GOOGLE_PROJECT_ID is required}
+      - MN_SERVICE_SA_GOOGLE_PRIVATE_KEY_ID=${MN_SERVICE_SA_GOOGLE_PRIVATE_KEY_ID:?MN_SERVICE_SA_GOOGLE_PRIVATE_KEY_ID is required}
+      - MN_SERVICE_SA_GOOGLE_PRIVATE_KEY=${MN_SERVICE_SA_GOOGLE_PRIVATE_KEY:?MN_SERVICE_SA_GOOGLE_PRIVATE_KEY is required}
+      - MN_SERVICE_SA_GOOGLE_CLIENT_EMAIL=${MN_SERVICE_SA_GOOGLE_CLIENT_EMAIL:?MN_SERVICE_SA_GOOGLE_CLIENT_EMAIL is required}
+      - MN_SERVICE_SA_GOOGLE_CLIENT_ID=${MN_SERVICE_SA_GOOGLE_CLIENT_ID:?MN_SERVICE_SA_GOOGLE_CLIENT_ID is required}
+      - MN_SERVICE_SA_GOOGLE_AUTH_URI=${MN_SERVICE_SA_GOOGLE_AUTH_URI:?MN_SERVICE_SA_GOOGLE_AUTH_URI is required}
+      - MN_SERVICE_SA_GOOGLE_TOKEN_URI=${MN_SERVICE_SA_GOOGLE_TOKEN_URI:?MN_SERVICE_SA_GOOGLE_TOKEN_URI is required}
+      - MN_SERVICE_SA_GOOGLE_AUTH_PROVIDER_X509_CERT_URL=${MN_SERVICE_SA_GOOGLE_AUTH_PROVIDER_X509_CERT_URL:?MN_SERVICE_SA_GOOGLE_AUTH_PROVIDER_X509_CERT_URL is required}
+      - MN_SERVICE_SA_GOOGLE_CLIENT_X509_CERT_URL=${MN_SERVICE_SA_GOOGLE_CLIENT_X509_CERT_URL:?MN_SERVICE_SA_GOOGLE_CLIENT_X509_CERT_URL is required}
+      - MN_SERVICE_SA_GOOGLE_UNIVERSE_DOMAIN=${MN_SERVICE_SA_GOOGLE_UNIVERSE_DOMAIN:?MN_SERVICE_SA_GOOGLE_UNIVERSE_DOMAIN is required}
     volumes:
     - n8n_data:/data/n8n
   postgresql: !reset null

docker-compose.yml

@@ -34,6 +34,17 @@ services:
       - N8N_LOG_LEVEL=debug
       - N8N_LOG_OUTPUT=console
       - TZ=${TZ:-America/New_York}
+      - MN_SERVICE_SA_GOOGLE_TYPE=${MN_SERVICE_SA_GOOGLE_TYPE:-GOOGLE_TYPE}
+      - MN_SERVICE_SA_GOOGLE_PROJECT_ID=${MN_SERVICE_SA_GOOGLE_PROJECT_ID:-PROJECT_ID}
+      - MN_SERVICE_SA_GOOGLE_PRIVATE_KEY_ID=${MN_SERVICE_SA_GOOGLE_PRIVATE_KEY_ID:-PRIVATE_KEY_ID}
+      - MN_SERVICE_SA_GOOGLE_PRIVATE_KEY=${MN_SERVICE_SA_GOOGLE_PRIVATE_KEY:-PRIVATE_KEY}
+      - MN_SERVICE_SA_GOOGLE_CLIENT_EMAIL=${MN_SERVICE_SA_GOOGLE_CLIENT_EMAIL:-CLIENT_EMAIL}
+      - MN_SERVICE_SA_GOOGLE_CLIENT_ID=${MN_SERVICE_SA_GOOGLE_CLIENT_ID:-CLIENT_ID}
+      - MN_SERVICE_SA_GOOGLE_AUTH_URI=${MN_SERVICE_SA_GOOGLE_AUTH_URI:-AUTH_URI}
+      - MN_SERVICE_SA_GOOGLE_TOKEN_URI=${MN_SERVICE_SA_GOOGLE_TOKEN_URI:-TOKEN_URI}
+      - MN_SERVICE_SA_GOOGLE_AUTH_PROVIDER_X509_CERT_URL=${MN_SERVICE_SA_GOOGLE_AUTH_PROVIDER_X509_CERT_URL:-CERT_URL}
+      - MN_SERVICE_SA_GOOGLE_CLIENT_X509_CERT_URL=${MN_SERVICE_SA_GOOGLE_CLIENT_X509_CERT_URL:-CLIENT_CERT_URL}
+      - MN_SERVICE_SA_GOOGLE_UNIVERSE_DOMAIN=${MN_SERVICE_SA_GOOGLE_UNIVERSE_DOMAIN:-UNIVERSE_DOMAIN}
     volumes:
       - n8n_data:/home/node/.n8n
       - ./scripts:/home/node/scripts