fix: Add environment variable truncation fix documentation and verification script

- Document the solution for Docker environment variable truncation issue
- Add verification script to test the fix
- Include proper .env configuration with quoted values
- Add Docker network (172.20.0.0/16) to allowed IPs

The fix ensures bcrypt hashes and other values with special characters
are properly passed to Docker containers without truncation.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/verify-env-fix.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+echo "========================================"
+echo "MinIO WebUI - Environment Variable Fix Verification"
+echo "========================================"
+echo ""
+
+# Stop existing containers
+echo "1. Stopping existing containers..."
+docker compose -f docker-compose.dev.yml down
+
+echo ""
+echo "2. Rebuilding and starting containers..."
+docker compose -f docker-compose.dev.yml up -d --build
+
+# Wait for container to start
+echo ""
+echo "3. Waiting for containers to start..."
+sleep 5
+
+# Check environment variables
+echo ""
+echo "4. Checking environment variables in container:"
+echo "-----------------------------------------------"
+docker exec minio-webui-backend-dev sh -c 'echo "ADMIN_PASSWORD_HASH length: ${#ADMIN_PASSWORD_HASH}"'
+docker exec minio-webui-backend-dev sh -c 'echo "ADMIN_PASSWORD_HASH prefix: ${ADMIN_PASSWORD_HASH:0:7}"'
+docker exec minio-webui-backend-dev sh -c 'echo "JWT_SECRET length: ${#JWT_SECRET}"'
+docker exec minio-webui-backend-dev sh -c 'echo "ALLOWED_IPS: $ALLOWED_IPS"'
+
+# Run debug script
+echo ""
+echo "5. Running auth debug:"
+echo "---------------------"
+./scripts/debug-auth.sh
+
+# Test API
+echo ""
+echo "6. Testing API directly:"
+echo "-----------------------"
+./scripts/test-auth-api.sh
+
+echo ""
+echo "========================================"
+echo "Check the outputs above. The password hash should be 60 characters long"
+echo "and start with '$2b$12$'. If successful, you should be able to log in"
+echo "with password 'admin123'."
+echo "========================================"