fix(service-proxy): well defined urls for exposed services with max 63

[uwe-mayer]

Description

This enforces:

• no -- in Cluster names
• max length of 40 chars for Cluster names, so we make sure the hash of service-name+namespace fits into the exposed service subdomain.

Exposed service URLs will look like:

https://$cluster--$hash.$organisation.$basedomain, where $hash = service--$namespace

This reduces all host decomposition to only use the extracted ClusterName from the incoming request. We made sure this is welldefined and unambigous.

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI
• 📦 Chore (Release)
• ⏩ Revert

Related Tickets & Documents

• Related Issue [FEAT] - Validation and Generation of ServiceProxy URLs #78
• Closes # 🐛 [BUG] - service-proxy err: "no upstream found for: /" #661

Remove if not applicable

Changed tests?

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help
• Separate ticket for tests # (issue/pr)

[richardtief]

Could you please update the docs along the changes made: https://github.com/cloudoperators/greenhouse/blob/main/docs/user-guides/plugin/plugin-deployment.md#urls-for-exposed-services

[uwe-mayer]

Could you please update the docs along the changes made: https://github.com/cloudoperators/greenhouse/blob/main/docs/user-guides/plugin/plugin-deployment.md#urls-for-exposed-services

Updated the docs

[richardtief]

Thanks!