feat: simplify MongoDB initialization in docker-compose

[AchrefHemissi]

• Replace complex inline bash script with dedicated init script
• Use MongoDB built-in /docker-entrypoint-initdb.d/ mechanism
• Create scripts/mongo-init.sh for user creation
• Improve readability and maintainability

Fixes #3632

[github-actions]

💕 Thank you for your contribution and please kindly read and sign our CLA. CLA Docs

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[Copilot]

Pull request overview

This PR refactors MongoDB initialization in docker-compose by replacing a complex inline bash script with a dedicated initialization script. The changes leverage MongoDB's built-in /docker-entrypoint-initdb.d/ mechanism for better maintainability and readability.

Key Changes:

• Created scripts/mongo-init.sh for MongoDB user initialization
• Simplified MongoDB service configuration by removing inline bash command
• Cleaned up Redis command formatting for consistency
• Removed extraneous whitespace in docker-compose.yml

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
scripts/mongo-init.sh	New dedicated script for creating MongoDB OpenIM user using mongosh
docker-compose.yml	Simplified MongoDB service by mounting init script, refactored command structure, and cleaned up formatting

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The MongoDB init script doesn't check if the user already exists before attempting to create it. Unlike the original inline script which included a !db.getUser() check, this new script will fail on subsequent container restarts when the data volume persists and the user already exists.

Consider adding idempotency by checking if the user exists first:

use ${MONGO_INITDB_DATABASE}
if (!db.getUser("${MONGO_OPENIM_USERNAME}")) {
  db.createUser({
    user: "${MONGO_OPENIM_USERNAME}",
    pwd: "${MONGO_OPENIM_PASSWORD}",
    roles: [{role: "readWrite", db: "${MONGO_INITDB_DATABASE}"}]
  })
  print("OpenIM user created successfully")
} else {
  print("User already exists: ${MONGO_OPENIM_USERNAME}")
}

Suggested change

	db.createUser({
	user: "${MONGO_OPENIM_USERNAME}",
	pwd: "${MONGO_OPENIM_PASSWORD}",
	roles: [{role: "readWrite", db: "${MONGO_INITDB_DATABASE}"}]
	})
	print("OpenIM user created successfully")
	if (!db.getUser("${MONGO_OPENIM_USERNAME}")) {
	db.createUser({
	user: "${MONGO_OPENIM_USERNAME}",
	pwd: "${MONGO_OPENIM_PASSWORD}",
	roles: [{role: "readWrite", db: "${MONGO_INITDB_DATABASE}"}]
	})
	print("OpenIM user created successfully")
	} else {
	print("User already exists: ${MONGO_OPENIM_USERNAME}")
	}