feat: add required environment variable checks for stack deployment

docker-compose.prod.yml

@@ -34,6 +34,7 @@ services:
       SPRING_DATASOURCE_URL: jdbc:postgresql://condado-newsletter-postgres:5432/${APP_DB_NAME:-condado}
       SPRING_DATASOURCE_USERNAME: ${SPRING_DATASOURCE_USERNAME:-condado}
       SPRING_DATASOURCE_PASSWORD: ${SPRING_DATASOURCE_PASSWORD:-condado}
+      APP_PASSWORD: ${APP_PASSWORD}
       JWT_SECRET: ${JWT_SECRET}
       JWT_EXPIRATION_MS: ${JWT_EXPIRATION_MS:-86400000}
       MAIL_HOST: ${MAIL_HOST}