The Apache mod_auth_openidc requires explicit configuration in
order to read the X-Forwarded-Proto from the reverse proxy as
of version v2.4.11 which comes in from Ubuntu Jammy.
Eventually this will need to become the default and the
variable added in this patch can be removed.
Change-Id: Ic9d37a8463d137508d20de20b10af806a223f852
b54478e7e1