feat: add Grafana domain update functionality in gen-observability script

[Aravinda-HWK]

📌 Description

Add a code section to update the <MAIL_DOMAIN> value in the grafana.ini configuration file coming from the silver-config.

• Closes [FEATURE] Add grafana.ini update script to change the domain #274

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🔍 Changes Made

• Update the gen-observability.sh to update grafana.ini file

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✅ Checklist (Email System)

• Core services tested (SMTP, IMAP, mail storage, end-to-end delivery)
• Security & compliance verified (auth via Thunder IDP, TLS, DKIM/SPF/DMARC, spam/virus filtering)
• Configuration & deployment checked (configs generated, Docker/Compose updated)
• Reliability confirmed (error handling, logging, monitoring)
• Documentation & usage notes updated (README, deployment, API)

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🧪 Testing Instructions

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📷 Screenshots / Logs (if applicable)

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⚠️ Notes for Reviewers

[gemini-code-assist]

Summary of Changes

Hello @Aravinda-HWK, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the gen-observability.sh script by introducing an automated mechanism to configure Grafana. It ensures that the Grafana configuration file (grafana.ini) correctly reflects the system's mail domain, streamlining the setup process and preventing manual configuration errors related to domain settings.

Highlights

• Grafana Domain Update: Added functionality to the gen-observability.sh script to automatically update the <MAIL_DOMAIN> placeholder in the grafana.ini configuration file with the actual MAIL_DOMAIN value, ensuring correct domain configuration for Grafana.

Changelog

• services/config-scripts/gen-observability.sh
  • Defined a new variable GRAFANA_CONFIG_FILE to specify the path to grafana.ini.
  • Implemented a new section to update the Grafana domain in grafana.ini by replacing a placeholder with the actual MAIL_DOMAIN.
  • Added error handling to check for the existence of the grafana.ini file before modification.
  • Adjusted file ownership for the modified grafana.ini.

Activity

• No human activity on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request adds functionality to the gen-observability.sh script to update the domain in the grafana.ini configuration file. The changes are logical and follow the existing script's structure. The identified potential issue regarding silent failure if no domain is configured is valid and the suggested check improves robustness.

[maneeshaxyz]

LGTM.