feat: support providing external servers

[jeremylvln]

The external servers can be provided by filling the externalServers field in the MinecraftCluster:

apiVersion: shulkermc.io/v1alpha1
kind: MinecraftCluster
metadata:
  name: getting-started
spec:
  externalServers:
    - name: external
      address: 127.0.0.1
      tags:
        - my_tag
    - name: external2
      address: 127.0.0.2

Closes #630

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 28 lines in your changes missing coverage. Please review.

Project coverage is 32.99%. Comparing base (a8e2e70) to head (c39ba63).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...lker-operator/src/reconcilers/proxy_fleet/fleet.rs	84.14%	13 Missing ⚠️
...-operator/src/reconcilers/minecraft_cluster/mod.rs	0.00%	8 Missing ⚠️
...s/minecraft_cluster/external_servers_config_map.rs	53.33%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #631      +/-   ##
==========================================
+ Coverage   31.65%   32.99%   +1.33%     
==========================================
  Files          58       59       +1     
  Lines        3124     3228     +104     
==========================================
+ Hits          989     1065      +76     
- Misses       2135     2163      +28     

Flag	Coverage Δ
shulker-addon-matchmaking	23.02% <ø> (ø)
shulker-crds	92.30% <ø> (ø)
shulker-operator	60.25% <73.33%> (+0.91%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ges/shulker-crds/src/v1alpha1/minecraft_cluster.rs	0.00% <ø> (ø)
...s/minecraft_cluster/external_servers_config_map.rs	53.33% <53.33%> (ø)
...-operator/src/reconcilers/minecraft_cluster/mod.rs	11.53% <0.00%> (-0.97%)	⬇️
...lker-operator/src/reconcilers/proxy_fleet/fleet.rs	81.93% <84.14%> (+0.68%)	⬆️

[ajh123]

@jeremylvln How would you predefine the proxy's forwarding secret? External servers are "external" so Shulker can't automatically assign the secret on them.

Without this, external severs won't work because they can't be authenticated by the proxy.

[jeremylvln]

@jeremylvln How would you predefine the proxy's forwarding secret? External servers are "external" so Shulker can't automatically assign the secret on them.

Without this, external severs won't work because they can't be authenticated by the proxy.

Shulker generates a random secret when creating a MinecraftCluster and then never modifies it. It is stored in a secret named forwarding-secret.

You can change it if you want, but you'll need to restart the proxies. Or you can take it and update your servers.

I keep in mind that I should say this in the future documentation!

[github-actions]

🎉 This issue has been resolved in version 0.10.0 🎉

The release is available on:

• v0.10.0
• v0.10.0
• GitHub release

Your semantic-release bot 📦🚀

[ajh123]

@jeremylvln Can confirm these features work successfully!

As you can see, I can connect to my Fabric server using a Shulker managed proxy.