https://steemit.com/security/@the-tech-guy/let-s-encrypt-ssl-certificate-for-gitlab-with-docker-on-synology
https://github.com/sameersbn/docker-gitlab/tree/v8.0.3#ssl
https://blog.csdn.net/yinxiulong/article/details/79703990
https://gist.github.com/mattcarlotta/4d9fdb90376c5d13db2c1b69a2d557a6
/usr/syno/etc/certificate/system/default
-r-------- 1 root root 2162 Jul 17 11:20 cert.pem
-r-------- 1 root root 1646 Jul 17 11:20 chain.pem
-r-------- 1 root root 3810 Jul 17 11:20 fullchain.pem
-r-------- 1 root root 1703 Jul 17 11:20 privkey.pem
/usr/syno/etc/ssl
-r-------- 1 root root 424 Jan 4 2018 dh2048.pem
privkey.pem → gitlab.key
cert.pem → gitlab.crt
dh2048.pem → dhparam.pem
/volume1/docker/gitlab/gitlab/certs
-rwxr-xr-x 1 root root 424 Jul 17 12:19 dhparam.pem
-rwxr-xr-x 1 root root 2162 Jul 17 12:43 gitlab.crt
-rw-r--r-- 1 root root 1009 Jul 17 12:42 gitlab.csr
-rwxr-xr-x 1 root root 1703 Jul 17 12:43 gitlab.key
-rwxr-xr-x 1 root root 424 Jul 17 12:19 dhparam.pem
-rwxr-xr-x 1 root root 2162 Jul 17 12:43 gitlab.crt
-rwxr-xr-x 1 root root 1703 Jul 17 12:43 gitlab.key
GITLAB_HTTPS true
SSL_SELF_SIGNED true