Add docker-compose bind mount preview test case (#67)

Test case for coolify#7802 — reproduces the bug where bind mount
volumes from repo content get an incorrect -pr-N suffix during
Preview Deployments.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose-bind-mount-preview/README.md

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+# Docker Compose Bind Mount Preview Test
+
+Test case for [coolify#7802](https://github.com/coollabsio/coolify/issues/7802) — volume mappings from repo content in Preview Deployments.
+
+## Setup
+
+1. Add this repo as a Docker Compose resource in Coolify
+2. Set the base directory to `/docker-compose-bind-mount-preview`
+3. Deploy — should succeed (db_bootstrap runs the script from `./scripts`)
+4. Enable **Preview Deployments**
+5. Open a PR and deploy the preview
+
+## Expected
+
+The preview deployment should work the same as the main deployment — the `./scripts` bind mount should resolve to the repo's `scripts/` directory.
+
+## Actual (bug)
+
+The preview deployment fails because Coolify appends `-pr-N` to the bind mount path, looking for `scripts-pr-1` which doesn't exist.

docker-compose-bind-mount-preview/docker-compose.yml

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+services:
+
+  postgres:
+    image: postgres:16.4
+    container_name: postgres_test
+    restart: always
+    environment:
+      POSTGRES_USER: ${COMPOSE__POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${COMPOSE__POSTGRES_PASSWORD:-postgres}
+      POSTGRES_DB: ${COMPOSE__POSTGRES_DB:-postgres}
+    expose:
+      - "5432"
+    healthcheck:
+      test: [ "CMD-SHELL", "pg_isready -U postgres" ]
+      interval: 10s
+      retries: 5
+      start_period: 10s
+
+  db_bootstrap:
+    image: postgres:16.4
+    container_name: db_bootstrap_test
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      DB_HOST: ${COMPOSE__POSTGRES_HOST:-postgres}
+      DB_NAME: ${COMPOSE__POSTGRES_DB:-postgres}
+      DB_USER: ${COMPOSE__POSTGRES_USER:-postgres}
+      PGPASSWORD: ${COMPOSE__POSTGRES_PASSWORD:-postgres}
+    volumes:
+      - ./scripts:/scripts:ro
+    entrypoint: [ "bash", "/scripts/bootstrap_db.sh" ]
+    restart: "no"
+
+  main_service:
+    image: nginx:latest
+    container_name: nginx_server
+    ports:
+      - '0:80'
+    depends_on:
+      db_bootstrap:
+        condition: service_completed_successfully

docker-compose-bind-mount-preview/scripts/bootstrap_db.sh

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+#!/bin/bash
+set -e
+
+echo "Waiting for PostgreSQL to be ready..."
+until psql -h "$DB_HOST" -U "$DB_USER" -d "$DB_NAME" -c '\q' 2>/dev/null; do
+  sleep 1
+done
+
+echo "Creating test table..."
+psql -h "$DB_HOST" -U "$DB_USER" -d "$DB_NAME" <<SQL
+CREATE TABLE IF NOT EXISTS test_table (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+INSERT INTO test_table (name) VALUES ('hello from bootstrap');
+SQL
+
+echo "Bootstrap complete!"