Add openvpn and openconnect

test/testdata/openconnect/ocserv/Dockerfile

@@ -0,0 +1,11 @@
+FROM debian:trixie-slim@sha256:cedb1ef40439206b673ee8b33a46a03a0c9fa90bf3732f54704f99cb061d2c5a
+
+ARG OCSERV_VERSION=1.3.0-2
+
+RUN apt-get update \
+    && apt-get install --yes --no-install-recommends ocserv="${OCSERV_VERSION}" iproute2 python3 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY echo_server.py /usr/local/bin/openconnect-echo-server
+
+EXPOSE 443/tcp 443/udp

test/testdata/openconnect/ocserv/echo_server.py

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+#!/usr/bin/env python3
+import socket
+import threading
+
+
+def echo(connection):
+    with connection:
+        while True:
+            data = connection.recv(65536)
+            if not data:
+                return
+            connection.sendall(data)
+
+
+listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+listener.bind(("0.0.0.0", 18080))
+listener.listen()
+print("openconnect echo ready", flush=True)
+while True:
+    accepted, _ = listener.accept()
+    threading.Thread(target=echo, args=(accepted,), daemon=True).start()