Auto generate TODO list

docs/Makefile

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+.POSIX:
+
+todo:
+	printf "# TODO\n\n" > TODO.md
+	git grep -h TODO .. | sed 's/.* TODO /- /g' >> TODO.md

docs/TODO.md

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+# TODO
+
+- check if this is a bug
+- use Ansible wait_for /var/run/docker.sock
+- remote backend (etcd or minio)
+- convert to YAML for Terraform yamldecode
+- Optimize SELinux
+- Optimize firewall
+- change to /var/lib/lxd/server.crt after https://wiki.debian.org/LXD
+- use btrfs in k8s 1.19.8 https://github.com/kubernetes/kubernetes/issues/94335