adam.nz: # sudo certbot certonly --dns-cloudflare --dns-cloudflare-credentials /path/to/cloudflare.ini -d mera.spack.org --preferred-challenges dns-01

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# sudo certbot certonly --dns-cloudflare --dns-cloudflare-credentials /path/to/cloudflare.ini -d mera.spack.org --preferred-challenges dns-01

Create an SSL certificate for mera using Cloudflare DNS challenge. Format of cloudflare.ini is described here. Requires installing certbot and python3-certbot-dns-cloudflare packages in Ubuntu.