Fix sylvactl bootstrap

Francois Eleouetrequested to merge
fix-bootstrap into main

sylvactl bootstrap is failing on main:

sylvactl on  main via 🐹 v1.26.1 
❯ sylvactl bootstrap
Creating cluster "sylva" ...
 ✓ Ensuring node image (kindest/node:v1.34.0) 🖼
 ✓ Preparing nodes 📦  
 ✓ Writing configuration 📜 
 ✓ Starting control-plane 🕹️ 
 ✓ Installing CNI 🔌 
 ✓ Installing StorageClass 💾 
 ✗ Installing core controllers 📥
Error: failed to patch ConfigMap flux-system/proxy-env-vars: Object 'Kind' is missing in 'unstructured object has no kind'

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