Add a skeleton test-compose.yaml for docker-compose parsing work

Two busybox services (a worker echoing a fixed reply, a server that relays
it) exercising the compose fields we intend to support: services/image/
command, container_name, environment/env_file, depends_on (condition only),
stop_grace_period, networks (internal/external), ports, and bind + named
volumes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gv3s5jckJKzh6JkMoi2Akz

test-compose/compose.yaml

@@ -0,0 +1,45 @@
+services:
+  test-worker:
+    image: busybox:latest
+    container_name: test-worker1
+    command: ["sh", "/scripts/listen.sh"]
+    environment:
+      - WORKER_GREETING=Hello from environment
+    env_file:
+      - ./worker/worker.env
+    networks:
+      - test-intern-net
+    volumes:
+      - ./worker:/scripts:ro
+
+  test-server:
+    image: busybox:latest
+    command: ["sh", "/scripts/listen.sh"]
+    depends_on:
+      test-worker:
+        condition: service_started
+    environment:
+      - SERVER_ROLE=proxy
+    env_file:
+      - ./server/server.env
+    stop_grace_period: 20s
+    networks:
+      - test-intern-net
+      - test-extern-net
+      - test-preexisting-net
+    ports:
+      - "18080:80"
+    volumes:
+      - ./server:/scripts:ro
+      - test-server-log:/var/log
+
+networks:
+  test-intern-net:
+    internal: true
+  test-extern-net:
+    internal: false
+  test-preexisting-net:
+    external: true
+
+volumes:
+  test-server-log:

test-compose/server/handle.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "$(date) request received" >> /var/log/test-server.log
+nc test-worker1 80

test-compose/server/listen.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+echo "SERVER_ROLE=$SERVER_ROLE"
+echo "SERVER_ENV_FILE_VAR=$SERVER_ENV_FILE_VAR"
+nc -lk -p 80 -e /scripts/handle.sh

test-compose/server/server.env

@@ -0,0 +1 @@
+SERVER_ENV_FILE_VAR=set-from-server-env-file

test-compose/worker/handle.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo "Hello from test-worker"

test-compose/worker/listen.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+echo "WORKER_GREETING=$WORKER_GREETING"
+echo "WORKER_ENV_FILE_VAR=$WORKER_ENV_FILE_VAR"
+nc -lk -p 80 -e /scripts/handle.sh

test-compose/worker/worker.env

@@ -0,0 +1 @@
+WORKER_ENV_FILE_VAR=set-from-worker-env-file