feat(mise): Allow to declare bootstrap package per host

Whitout this, you can only specify packages per os (distrib).

.chezmoitemplates/mise-bootstrap-packages

@@ -41,3 +41,15 @@
 {{- end }}
 
 {{- end }}
+
+{{/* Host specific */}}
+{{- $hostname := output "hostname" | trim -}}
+{{- $currentHost := index .hosts $hostname -}}
+{{- if $currentHost }}
+  {{- if hasKey $currentHost "packages" }}
+# Paquets personnalisés pour l'hôte {{ $hostname }}
+{{- range $currentHost.packages }}
+"{{- . }}" = "latest"
+{{- end }}
+{{- end }}
+{{- end }}