[ENHANCEMENT] document process to recover old but deleted GitHub Releases

[jessesimpson36]

Describe the use case:

helm.camunda.io is hosted in github pages, and references links to GitHub Releases to deliver camunda helm charts whenever someone calls helm install. In the event that a bad actor deletes the github release, or uploads malicious data into an old helm chart, we need to have a way to recreate the GitHub Release so that we can recover from that scenario.

This could include

1. recovering helm charts from local helm cache
2. checking out an old commit and running helm package
3. try to get old commits github actions workflows working
4. ...

But we should identify those strategies and prioritize which is the best.

Describe the enhancement/feature:

Desired outcome and acceptance tests: