DNM: messy PR with local TLS key management

[deer-wmde]

https://phabricator.wikimedia.org/T383335

Do not merge! This PR exists for historical reasons, to save the work we did on trying out self-manging self-signed certificates etc for local HTTPS usage

After discussion we concluded it probably adds too much trust for dev machines and in parts production setup

Instead an approach with cert-manager and cert distribution at runtime should get investigated.

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