Set protocol in ROOT_URL to https if tls is enabled.
Never use (index .Values.ingress.tls 0).hosts. It is used for cert and
may contains wildcard.
We also don't need to check .Values.ingress.hosts again, because we
alrealy set it to .Values.gitea.config.server.DOMAIN
Signed-off-by: 胡玮文 <sehuww@mail.scut.edu.cn>
