Automatically deploy with https

[faysal-ishtiaq]

Closes #64

[faysal-ishtiaq]

Runs the server on port 80 when $HOST_FQDN and $WEBMASTER_EMAIL are not set. When set, serves on port 443.

Demo: dev4.opencdms.org [instance deleted 25 April 2023]

[isedwards]

@fabiosato @AbnerBissolli - are you happy for this to be merged to the dev branch? When $HOST_FQDN and $WEBMASTER_EMAIL environment variables are not set the deployment will continue to use HTTP. If the environment variables are set then a LetsEncrypt security certificate will be automatically set up and the application will be served over HTTPS.

[fabiosato]

@AbnerBissolli do you think it's safe to merge this to dev?