[bitnami/mongodb-sharded] Fix "Authentication Failed" error if the mongodb-sharded Helm chart is deployed with custom root username

[jacky96623]

Fix "Authentication Failed" error if the mongodb-sharded Helm chart is deployed with custom root username

Description of the change

This change replaces the hardcoded root username root by the dynamically injected environment variable MONGODB_ROOT_USERNAME.

Benefits

Due to the hardcode, "Authentication Failed" error occurs during the initialisation of a sharded MongoDB if a custom root username is supplied by the user (since the creation of admin user uses the variable MONGODB_ROOT_USERNAME instead of the hardcoded root username root). After the change, this error can be fixed.

Possible drawbacks

I believe this change has no drawback.

Applicable issues

N/A

Additional information

• Hope that my PR is appropriate enough.
• If it passes review, I hope that this can be released as soon as possible since I found this when I encountered the stated error during my work to set up a sharded MongoDB cluster.

[javsalgar]

Hi!

Thank you so much for the PR! Could you fix the DCO issue?

[jacky96623]

@javsalgar Sure! Please if it works now.

[aoterolorenzo]

Thanks for the contribution!