Added
* Add the `reuse_key` boolean parameter in certificate section: if `true`, the
existing private key will be reused for the target certificate when renewed
* Add the "one-shot" mode: using the `--one-shot` flag, DNSroboCert will process
only once the provided configuration, create/update/renew/delete certificates,
then return immediately without setting up an automated renewal process or a
configuration file watch
Modified
* Migrate the docker image from the Alpine base to the Debian base, in order
to get better DNS support on Kubernetes, and benefit from pre-compiled wheels
for cffi, lxml and cryptography
* Update Certbot to 1.18.0
* Update Lexicon to 3.7.0 (add `oci` and `vercel` providers)
Removed
* Drop Docker support on `ppc64le` architecture