[bitnami/memcached] Add optional emptyDir medium configuration

[nhh]

Description of the change

This change adds the ability to define the emptyDir configuration of memcache to be "Memory"

Benefits

People can decide to configure their tmp directory to be tmpfs (RAM-backed filesystem)

Possible drawbacks

See k8s docs for memory impact on tmpfs volumes: https://kubernetes.io/docs/concepts/storage/volumes/#emptydir

Additional information

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)

[jotamartos]

The change looks good to me. However, I think you also need to apply the change in the templates/statefulset.yaml file.

[nhh]

The change looks good to me. However, I think you also need to apply the change in the templates/statefulset.yaml file.

@jotamartos thx for having a look, I added your suggestions!

[nhh]

There were merge conflicts due to an automatic update happening in the mean time using my previous used chart version 7.4.15, which I did not know about. I thought it was the bot hallucinating and tried to remove it from the changelog.

I now need to to everything all over again