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/scripts/bootstrap_db.sh

@@ -0,0 +1,20 @@
+#!/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!"