hotfix(config): split common VPN options per VPN type

- Split `VPN_ENDPOINT_IP` in `OPENVPN_ENDPOINT_IP` and `WIREGUARD_ENDPOINT_IP`
- Split `VPN_ENDPOINT_PORT` in `OPENVPN_ENDPOINT_PORT` and `WIREGUARD_ENDPOINT_PORT`
- Fixes bad usage of Wireguard config file endpoint for OpenVPN #2347

Dockerfile

@@ -76,10 +76,10 @@ LABEL \
 ENV VPN_SERVICE_PROVIDER=pia \
     VPN_TYPE=openvpn \
     # Common VPN options
-    VPN_ENDPOINT_IP= \
-    VPN_ENDPOINT_PORT= \
     VPN_INTERFACE=tun0 \
     # OpenVPN
+    OPENVPN_ENDPOINT_IP= \
+    OPENVPN_ENDPOINT_PORT= \
     OPENVPN_PROTOCOL=udp \
     OPENVPN_USER= \
     OPENVPN_PASSWORD= \
@@ -93,6 +93,8 @@ ENV VPN_SERVICE_PROVIDER=pia \
     OPENVPN_PROCESS_USER=root \
     OPENVPN_CUSTOM_CONFIG= \
     # Wireguard
+    WIREGUARD_ENDPOINT_IP= \
+    WIREGUARD_ENDPOINT_PORT= \
     WIREGUARD_CONF_SECRETFILE=/run/secrets/wg0.conf \
     WIREGUARD_PRIVATE_KEY= \
     WIREGUARD_PRIVATE_KEY_SECRETFILE=/run/secrets/wireguard_private_key \