[bitnami/influxdb] Feature to restore from AWS S3

[shreekumar2901]

Description of the change

This contribution includes a feature to restore data from AWS S3 endpoint. Whenever influxdb deployment comes up, an initContainer will be spinned up and it will fetch the data from the backup stored in AWS s3. The restored data will be stored in a separate PVC.

Benefits

Automatic restore of backed up data from AWS S3

Possible drawbacks

• When no providers are provided(i.e data is stored in PVC itself) ideally restore should happen from backups directory itself. The proposed change does not include this scenario.
• Proposed change is tested only with AWS S3 endpoint

Applicable issues

When backup and restore is enabled with only PVC(i.e no external providers such as AWS), restore won't work. So, in this scenario, it's not recommended with the proposed change to enable restore.

Additional information

The restore PVC is mounted to the influxdb deployment. Restore scripts can be included in custom-init-scripts

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! Please let us know when it is ready for review.

[andilar]

OSPO check successful @shreekumar2901. 🥇

[shreekumar2901]

@javsalgar Ready for Review

[jotamartos]

Hi @shreekumar2901,

Thank you for your contribution. This is a very specific use-case, highly attached to AWS, and the changes you are applying can be easily deployed using influxdb.initContainers, influxdb.extraVolumeMounts, influxdb.extraVolumes and extraDeploy parameters.

I'm going to close this PR now but I'd like to thank you for taking the time to propose this change. We will revisit this feature in the future if more users request it.