add container network integration test

dockerfiles/container-networking/docker-compose.yml

@@ -0,0 +1,17 @@
+services:
+  producer:
+    image: qmcgaw/gluetun:v3.35.0
+    cap_add:
+      - NET_ADMIN
+    environment:
+      - VPN_SERVICE_PROVIDER=${VPN_SERVICE_PROVIDER}
+      - OPENVPN_USER=${OPENVPN_USER}
+      - OPENVPN_PASSWORD=${OPENVPN_PASSWORD}
+      - SERVER_COUNTRIES=${SERVER_COUNTRIES}
+  consumer:
+    depends_on:
+      - producer
+    image: nginx:1.25.1
+    network_mode: "service:producer"
+    labels:
+      - "com.centurylinklabs.watchtower.depends-on=/wt-contnet-producer-1"

scripts/contnet-tests.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+set -e
+
+function exit_env_err() {
+  >&2 echo "Required environment variable not set: $1"
+  exit 1
+}
+
+if [ -z "$VPN_SERVICE_PROVIDER" ]; then exit_env_err "VPN_SERVICE_PROVIDER"; fi
+if [ -z "$OPENVPN_USER" ]; then exit_env_err "OPENVPN_USER"; fi
+if [ -z "$OPENVPN_PASSWORD" ]; then exit_env_err "OPENVPN_PASSWORD"; fi
+# if [ -z "$SERVER_COUNTRIES" ]; then exit_env_err "SERVER_COUNTRIES"; fi
+
+
+export SERVER_COUNTRIES=${SERVER_COUNTRIES:"Sweden"}
+REPO_ROOT="$(git rev-parse --show-toplevel)"
+COMPOSE_FILE="$REPO_ROOT/dockerfiles/container-networking/docker-compose.yml"
+DEFAULT_WATCHTOWER="$REPO_ROOT/watchtower"
+WATCHTOWER="$*"
+WATCHTOWER=${WATCHTOWER:-$DEFAULT_WATCHTOWER}
+echo "repo root path is $REPO_ROOT"
+echo "watchtower path is $WATCHTOWER"
+echo "compose file path is $COMPOSE_FILE"
+
+echo; echo "=== Forcing network container producer update..."
+
+echo "Pull previous version of gluetun..."
+docker pull qmcgaw/gluetun:v3.34.3
+echo "Fake new version of gluetun by retagging v3.34.4 as v3.35.0..."
+docker tag qmcgaw/gluetun:v3.34.3  qmcgaw/gluetun:v3.35.0
+
+echo; echo "=== Creating containers..."
+
+docker compose -p "wt-contnet" -f "$COMPOSE_FILE" up -d
+
+echo; echo "=== Running watchtower"
+$WATCHTOWER --run-once
+
+echo; echo "=== Removing containers..."
+
+docker compose -p "wt-contnet" -f "$COMPOSE_FILE" down