fix: openvpn at /usr/sbin/openvpn2.5

- Fix operation on QNAP devices
- Refer to #157

Dockerfile

@@ -179,6 +179,7 @@ RUN apk add --no-cache --update -l apk-tools && \
     mv /usr/sbin/openvpn /usr/sbin/openvpn2.4 && \
     apk del openvpn && \
     apk add --no-cache --update openvpn ca-certificates iptables ip6tables unbound tzdata && \
+    mv /usr/sbin/openvpn /usr/sbin/openvpn2.5 && \
     rm -rf /var/cache/apk/* /etc/unbound/* /usr/sbin/unbound-* /etc/openvpn/*.sh /usr/lib/openvpn/plugins/openvpn-plugin-down-root.so && \
     deluser openvpn && \
     deluser unbound && \

internal/openvpn/start.go

@@ -15,7 +15,7 @@ var ErrVersionUnknown = errors.New("OpenVPN version is unknown")
 
 const (
 	binOpenvpn24 = "openvpn2.4"
-	binOpenvpn25 = "openvpn"
+	binOpenvpn25 = "openvpn2.5"
 )
 
 func start(ctx context.Context, starter command.Starter, version string, flags []string) (