[Feature][devlake] mysql connection config from environment variables

[pimperator]

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• I had searched in the issues and found no similar feature requirement.

Use case

running the devlake part (not config-ui, not grafana) we need to ingest the value of DB_URL (either from .env file or as environment variable) in order to set up the mysql connection
sadly this contains the full connection string

DB_URL=mysql://username:password@databasehost:3306/database?charset=utf8mb4&parseTime=True&loc=UTC

see https://github.com/apache/incubator-devlake/blob/main/env.example#L26

Usually (like for grafana and opendora) the connection is set up via DB_HOSTNAME, DB_USER, DB_PASSWORD, DB_NAME as environment variables that make us able to put DB_PASSWORD into an encrypted vault.
With the given solution above we need to create the connection string and store all data in a vault. Additionally it needs to be recreated on password reset.

Description

I suggest to use DB_HOSTNAME, DB_USER, DB_PASSWORD, DB_NAME for the database connection setup instead of DB_URL.
This makes us able to store DB_PASSWORD in an encrypted vault and rotate only that vault/value on password rotation.

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

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[riipeckx]

I started something in this PR #8127 :)