Caching get_certificate lookups in Caddy

At Oh Dear , our status pages can run on a customer&rsquo;s own domain, and we&rsquo;ve always served on-demand ACME certificates for them: someone points their domain at us, and Caddy provisions a Let&rsquo;s Encrypt certificate for it automatically. We&rsquo;re now adding a second option, letting customers bring their own certificate. For that, Caddy doesn&rsquo;t provision anything: it fetches…