Release v0.9.0

What's Changed

• minor doc improvements by @neoaggelos in #209
• add ubuntu:26.04 as supported base for image builder by @neoaggelos in #210
• Remove cgroupv1 configuration from default kubeadm profiles by @neoaggelos in #212
• Updates to base image builder script by @neoaggelos in #211
• bump kube-flannel v0.27.3 -> v0.28.4 by @neoaggelos in #206
• Upgrade to ClusterAPI v1beta2 contract by @neoaggelos in #208
• Update Go 1.26.3, ClusterAPI v1.13.2 by @neoaggelos in #213
• use new(expr) instead of ptr.Totype by @neoaggelos in #215
• Kubernetes v1.36 support by @neoaggelos in #214
• Bump GitHub actions versions by @neoaggelos in #216
• Clarify version support matrix by @neoaggelos in #217

Full Changelog: v0.8.6...v0.9.0