[bitnami/mongodb] Use actual hostname instead of localhost for mongodb_exporter URI string

[lasseoe]

Description of the change

With this change, the metrics container will use the actual pod hostname, instead of localhost for the MongoDB URI.

Benefits

In an mTLS setup, the metrics container is not allowed to connect to localhost, because "localhost" is not a valid hostname in the certificates, and shouldn't be either.

Possible drawbacks

None

Applicable issues

• fixes [bitnami/mongodb] metrics exporter doesn't work with mTLS #32191

Additional information

None

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)

[javsalgar]

Hi!

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

[lasseoe]

Hi!

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

There, all fixed :)