Don't write site.yml by manually

Makefile

@@ -8,3 +8,14 @@ syntax:
 
 yamllint:
 	find . -name \*.yml -exec yamllint {} \;
+
+site.yml: playbooks/*.yml
+	@{ \
+	    echo "---" ; \
+	    find playbooks/*.yml | while read play ; do \
+	        [ $$play == playbooks/devel.yml ] && continue ; \
+	        echo "- name: Configure $$(basename -s .yml $$play) hosts" ; \
+	        echo "  ansible.builtin.import_playbook:" ; \
+	        echo "    name: $$play" ; \
+	    done ; \
+	} > site.yml