Missing information about secrets docker features

[cotemok]

URL to the Wiki page

https://github.com/qdm12/gluetun-wiki/edit/main/setup/options/wireguard.md

What's missing?

Adding the names for information that can be put in secret files shall be welcomed.
I had to crawl the sources to get the variables names.

here is the list of the ones I found:

• OPENVPN_USER_SECRETFILE
• OPENVPN_PASSWORD_SECRETFILE
• WIREGUARD_CONF_SECRETFILE
• WIREGUARD_PRIVATE_KEY_SECRETFILE
• WIREGUARD_PRESHARED_KEY_SECRETFILE
• WIREGUARD_ADDRESSES_SECRETFILE
• OPENVPN_CLIENTCRT_SECRETFILE
• OPENVPN_CLIENTKEY_SECRETFILE
• OPENVPN_ENCRYPTED_KEY_SECRETFILE
• OPENVPN_KEY_PASSPHRASE_SECRETFILE
• HTTPPROXY_USER_SECRETFILE
• HTTPPROXY_PASSWORD_SECRETFILE
• SHADOWSOCKS_PASSWORD_SECRETFILE

[github-actions]

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