feat: Use pre-generated deploy key

bootstrap.sh

@@ -124,5 +124,9 @@ cilium-cli status --wait
 # cilium-cli connectivity test --namespace-labels pod-security.kubernetes.io/enforce=privileged
 
 echo "Bootstrapping flux..."
-flux bootstrap git --url ssh://git@huizinga.dev/infra/foundation --branch=main --path=clusters/${cluster_name} \
+flux bootstrap git \
+	--url ssh://git@huizinga.dev/infra/foundation \
+	--branch=main \
+	--private-key-file=clusters/${cluster_name}/deploy.key -s \
+	--path=clusters/${cluster_name} \
 	--components-extra=source-watcher