expose port 443 in Dockerfile

[chris48s]

If we don't explicitly specify a port, running node server will serve on port 80 if

shields/config/custom-environment-variables.yml

Line 20 in a7368b8

isSecure: 'HTTPS'

is false and 443 if it is true, but we don't expose 443 so if that var is true, the port we open in the dockerfile isn't the one the server is listening on.

We could explicitly tell the server to serve TLS on port 80, but I think it makes more sense to expose 443 to cover this case.

This related to #8424
The other thing we need to do on this repo is a PR bumping scoutcamp once we've done a release with badges/sc#6 in it
Then once we've got a docker image with that in it, we're on to PRs in the super secret devops repo 🤫

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